diff --git a/cli/smartcontract/testdata/nameservice/nns.go b/cli/smartcontract/testdata/nameservice/nns.go
index 076aaa438..82cc8374d 100644
--- a/cli/smartcontract/testdata/nameservice/nns.go
+++ b/cli/smartcontract/testdata/nameservice/nns.go
@@ -363,8 +363,8 @@ func SetAdminEventsFromApplicationLog(log *result.ApplicationLog) ([]*SetAdminEv
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SetAdminEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SetAdminEvent or
+// returns an error if it's not possible to do to so.
 func (e *SetAdminEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -456,8 +456,8 @@ func RenewEventsFromApplicationLog(log *result.ApplicationLog) ([]*RenewEvent, e
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to RenewEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to RenewEvent or
+// returns an error if it's not possible to do to so.
 func (e *RenewEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
diff --git a/cli/smartcontract/testdata/nex/nex.go b/cli/smartcontract/testdata/nex/nex.go
index ac530f79c..0d716adde 100644
--- a/cli/smartcontract/testdata/nex/nex.go
+++ b/cli/smartcontract/testdata/nex/nex.go
@@ -267,8 +267,8 @@ func OnMintEventsFromApplicationLog(log *result.ApplicationLog) ([]*OnMintEvent,
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to OnMintEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to OnMintEvent or
+// returns an error if it's not possible to do to so.
 func (e *OnMintEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
diff --git a/cli/smartcontract/testdata/notifications/rpcbindings.out b/cli/smartcontract/testdata/notifications/rpcbindings.out
index 4b95b5a65..1e873d611 100644
--- a/cli/smartcontract/testdata/notifications/rpcbindings.out
+++ b/cli/smartcontract/testdata/notifications/rpcbindings.out
@@ -216,7 +216,7 @@ func itemToLedgerBlock(item stackitem.Item, err error) (*LedgerBlock, error) {
 }
 
 // FromStackItem retrieves fields of LedgerBlock from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlock) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -338,7 +338,7 @@ func itemToLedgerBlockSR(item stackitem.Item, err error) (*LedgerBlockSR, error)
 }
 
 // FromStackItem retrieves fields of LedgerBlockSR from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlockSR) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -476,7 +476,7 @@ func itemToLedgerTransaction(item stackitem.Item, err error) (*LedgerTransaction
 }
 
 // FromStackItem retrieves fields of LedgerTransaction from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransaction) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -572,7 +572,7 @@ func itemToLedgerTransactionSigner(item stackitem.Item, err error) (*LedgerTrans
 }
 
 // FromStackItem retrieves fields of LedgerTransactionSigner from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransactionSigner) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -699,7 +699,7 @@ func itemToLedgerWitnessCondition(item stackitem.Item, err error) (*LedgerWitnes
 }
 
 // FromStackItem retrieves fields of LedgerWitnessCondition from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessCondition) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -739,7 +739,7 @@ func itemToLedgerWitnessRule(item stackitem.Item, err error) (*LedgerWitnessRule
 }
 
 // FromStackItem retrieves fields of LedgerWitnessRule from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessRule) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -793,8 +793,8 @@ func ComplicatedNameEventsFromApplicationLog(log *result.ApplicationLog) ([]*Com
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to ComplicatedNameEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to ComplicatedNameEvent or
+// returns an error if it's not possible to do to so.
 func (e *ComplicatedNameEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -854,8 +854,8 @@ func SomeMapEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeMapEven
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeMapEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeMapEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeMapEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -924,8 +924,8 @@ func SomeStructEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeStru
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeStructEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeStructEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeStructEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -989,8 +989,8 @@ func SomeArrayEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeArray
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeArrayEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeArrayEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeArrayEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
diff --git a/cli/smartcontract/testdata/notifications/rpcbindings_extended.out b/cli/smartcontract/testdata/notifications/rpcbindings_extended.out
index 9b269e2eb..3b2ab5c07 100755
--- a/cli/smartcontract/testdata/notifications/rpcbindings_extended.out
+++ b/cli/smartcontract/testdata/notifications/rpcbindings_extended.out
@@ -222,7 +222,7 @@ func itemToCrazyStruct(item stackitem.Item, err error) (*CrazyStruct, error) {
 }
 
 // FromStackItem retrieves fields of CrazyStruct from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *CrazyStruct) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -262,7 +262,7 @@ func itemToLedgerBlock(item stackitem.Item, err error) (*LedgerBlock, error) {
 }
 
 // FromStackItem retrieves fields of LedgerBlock from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlock) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -384,7 +384,7 @@ func itemToLedgerBlockSR(item stackitem.Item, err error) (*LedgerBlockSR, error)
 }
 
 // FromStackItem retrieves fields of LedgerBlockSR from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlockSR) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -522,7 +522,7 @@ func itemToLedgerTransaction(item stackitem.Item, err error) (*LedgerTransaction
 }
 
 // FromStackItem retrieves fields of LedgerTransaction from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransaction) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -618,7 +618,7 @@ func itemToLedgerTransactionSigner(item stackitem.Item, err error) (*LedgerTrans
 }
 
 // FromStackItem retrieves fields of LedgerTransactionSigner from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransactionSigner) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -745,7 +745,7 @@ func itemToLedgerWitnessCondition(item stackitem.Item, err error) (*LedgerWitnes
 }
 
 // FromStackItem retrieves fields of LedgerWitnessCondition from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessCondition) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -785,7 +785,7 @@ func itemToLedgerWitnessRule(item stackitem.Item, err error) (*LedgerWitnessRule
 }
 
 // FromStackItem retrieves fields of LedgerWitnessRule from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessRule) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -839,8 +839,8 @@ func ComplicatedNameEventsFromApplicationLog(log *result.ApplicationLog) ([]*Com
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to ComplicatedNameEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to ComplicatedNameEvent or
+// returns an error if it's not possible to do to so.
 func (e *ComplicatedNameEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -900,8 +900,8 @@ func SomeMapEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeMapEven
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeMapEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeMapEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeMapEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -1020,8 +1020,8 @@ func SomeStructEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeStru
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeStructEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeStructEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeStructEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -1072,8 +1072,8 @@ func SomeArrayEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeArray
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeArrayEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeArrayEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeArrayEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
diff --git a/cli/smartcontract/testdata/notifications/rpcbindings_guessed.out b/cli/smartcontract/testdata/notifications/rpcbindings_guessed.out
index 0fba2708c..5b4d429c1 100755
--- a/cli/smartcontract/testdata/notifications/rpcbindings_guessed.out
+++ b/cli/smartcontract/testdata/notifications/rpcbindings_guessed.out
@@ -222,7 +222,7 @@ func itemToLedgerBlock(item stackitem.Item, err error) (*LedgerBlock, error) {
 }
 
 // FromStackItem retrieves fields of LedgerBlock from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlock) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -344,7 +344,7 @@ func itemToLedgerBlockSR(item stackitem.Item, err error) (*LedgerBlockSR, error)
 }
 
 // FromStackItem retrieves fields of LedgerBlockSR from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlockSR) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -482,7 +482,7 @@ func itemToLedgerTransaction(item stackitem.Item, err error) (*LedgerTransaction
 }
 
 // FromStackItem retrieves fields of LedgerTransaction from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransaction) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -578,7 +578,7 @@ func itemToLedgerTransactionSigner(item stackitem.Item, err error) (*LedgerTrans
 }
 
 // FromStackItem retrieves fields of LedgerTransactionSigner from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransactionSigner) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -705,7 +705,7 @@ func itemToLedgerWitnessCondition(item stackitem.Item, err error) (*LedgerWitnes
 }
 
 // FromStackItem retrieves fields of LedgerWitnessCondition from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessCondition) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -745,7 +745,7 @@ func itemToLedgerWitnessRule(item stackitem.Item, err error) (*LedgerWitnessRule
 }
 
 // FromStackItem retrieves fields of LedgerWitnessRule from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessRule) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -785,7 +785,7 @@ func itemToUnnamed(item stackitem.Item, err error) (*Unnamed, error) {
 }
 
 // FromStackItem retrieves fields of Unnamed from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *Unnamed) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -839,8 +839,8 @@ func ComplicatedNameEventsFromApplicationLog(log *result.ApplicationLog) ([]*Com
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to ComplicatedNameEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to ComplicatedNameEvent or
+// returns an error if it's not possible to do to so.
 func (e *ComplicatedNameEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -900,8 +900,8 @@ func SomeMapEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeMapEven
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeMapEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeMapEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeMapEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -1033,8 +1033,8 @@ func SomeStructEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeStru
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeStructEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeStructEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeStructEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
@@ -1085,8 +1085,8 @@ func SomeArrayEventsFromApplicationLog(log *result.ApplicationLog) ([]*SomeArray
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to SomeArrayEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to SomeArrayEvent or
+// returns an error if it's not possible to do to so.
 func (e *SomeArrayEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
diff --git a/cli/smartcontract/testdata/structs/rpcbindings.out b/cli/smartcontract/testdata/structs/rpcbindings.out
index 29af22323..5ac5bdcd1 100644
--- a/cli/smartcontract/testdata/structs/rpcbindings.out
+++ b/cli/smartcontract/testdata/structs/rpcbindings.out
@@ -200,7 +200,7 @@ func itemToLedgerBlock(item stackitem.Item, err error) (*LedgerBlock, error) {
 }
 
 // FromStackItem retrieves fields of LedgerBlock from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlock) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -322,7 +322,7 @@ func itemToLedgerBlockSR(item stackitem.Item, err error) (*LedgerBlockSR, error)
 }
 
 // FromStackItem retrieves fields of LedgerBlockSR from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerBlockSR) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -460,7 +460,7 @@ func itemToLedgerTransaction(item stackitem.Item, err error) (*LedgerTransaction
 }
 
 // FromStackItem retrieves fields of LedgerTransaction from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransaction) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -556,7 +556,7 @@ func itemToLedgerTransactionSigner(item stackitem.Item, err error) (*LedgerTrans
 }
 
 // FromStackItem retrieves fields of LedgerTransactionSigner from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerTransactionSigner) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -683,7 +683,7 @@ func itemToLedgerWitnessCondition(item stackitem.Item, err error) (*LedgerWitnes
 }
 
 // FromStackItem retrieves fields of LedgerWitnessCondition from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessCondition) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -723,7 +723,7 @@ func itemToLedgerWitnessRule(item stackitem.Item, err error) (*LedgerWitnessRule
 }
 
 // FromStackItem retrieves fields of LedgerWitnessRule from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *LedgerWitnessRule) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -763,7 +763,7 @@ func itemToManagementABI(item stackitem.Item, err error) (*ManagementABI, error)
 }
 
 // FromStackItem retrieves fields of ManagementABI from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementABI) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -829,7 +829,7 @@ func itemToManagementContract(item stackitem.Item, err error) (*ManagementContra
 }
 
 // FromStackItem retrieves fields of ManagementContract from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementContract) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -897,7 +897,7 @@ func itemToManagementEvent(item stackitem.Item, err error) (*ManagementEvent, er
 }
 
 // FromStackItem retrieves fields of ManagementEvent from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementEvent) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -959,7 +959,7 @@ func itemToManagementGroup(item stackitem.Item, err error) (*ManagementGroup, er
 }
 
 // FromStackItem retrieves fields of ManagementGroup from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementGroup) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -1009,7 +1009,7 @@ func itemToManagementManifest(item stackitem.Item, err error) (*ManagementManife
 }
 
 // FromStackItem retrieves fields of ManagementManifest from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementManifest) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -1201,7 +1201,7 @@ func itemToManagementMethod(item stackitem.Item, err error) (*ManagementMethod,
 }
 
 // FromStackItem retrieves fields of ManagementMethod from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementMethod) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -1281,7 +1281,7 @@ func itemToManagementParameter(item stackitem.Item, err error) (*ManagementParam
 }
 
 // FromStackItem retrieves fields of ManagementParameter from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementParameter) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -1330,7 +1330,7 @@ func itemToManagementPermission(item stackitem.Item, err error) (*ManagementPerm
 }
 
 // FromStackItem retrieves fields of ManagementPermission from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *ManagementPermission) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -1402,7 +1402,7 @@ func itemToStructsInternal(item stackitem.Item, err error) (*StructsInternal, er
 }
 
 // FromStackItem retrieves fields of StructsInternal from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *StructsInternal) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
diff --git a/cli/smartcontract/testdata/verifyrpc/verify.go b/cli/smartcontract/testdata/verifyrpc/verify.go
index dd3539901..be1f5c671 100644
--- a/cli/smartcontract/testdata/verifyrpc/verify.go
+++ b/cli/smartcontract/testdata/verifyrpc/verify.go
@@ -102,8 +102,8 @@ func HelloWorldEventsFromApplicationLog(log *result.ApplicationLog) ([]*HelloWor
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to HelloWorldEvent and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to HelloWorldEvent or
+// returns an error if it's not possible to do to so.
 func (e *HelloWorldEvent) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")
diff --git a/pkg/smartcontract/rpcbinding/binding.go b/pkg/smartcontract/rpcbinding/binding.go
index 746dcb34b..5f1495af3 100644
--- a/pkg/smartcontract/rpcbinding/binding.go
+++ b/pkg/smartcontract/rpcbinding/binding.go
@@ -236,7 +236,7 @@ func itemTo{{toTypeName $name}}(item stackitem.Item, err error) (*{{toTypeName $
 }
 
 // FromStackItem retrieves fields of {{toTypeName $name}} from the given stack item
-// and returns an error if so.
+// or returns an error if it's not possible to do to so.
 func (res *{{toTypeName $name}}) FromStackItem(item stackitem.Item) error {
 	arr, ok := item.Value().([]stackitem.Item)
 	if !ok {
@@ -287,8 +287,8 @@ func {{$e.Name}}sFromApplicationLog(log *result.ApplicationLog) ([]*{{$e.Name}},
 	return res, nil
 }
 
-// FromStackItem converts provided stackitem.Array to {{$e.Name}} and
-// returns an error if so.
+// FromStackItem converts provided stackitem.Array to {{$e.Name}} or
+// returns an error if it's not possible to do to so.
 func (e *{{$e.Name}}) FromStackItem(item *stackitem.Array) error {
 	if item == nil {
 		return errors.New("nil item")