diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 4762803a3..a762830f1 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -1674,7 +1674,7 @@ func (bc *Blockchain) initVerificationVM(ic *interop.Context, hash util.Uint160,
 			return ErrInvalidVerificationContract
 		}
 		initMD := cs.Manifest.ABI.GetMethod(manifest.MethodInit)
-		v.LoadScriptWithHash(cs.Script, hash, smartcontract.ReadStates)
+		v.LoadScriptWithHash(cs.Script, hash, smartcontract.ReadStates|smartcontract.AllowCall)
 		v.Jump(v.Context(), md.Offset)
 
 		if cs.ID < 0 {
diff --git a/pkg/core/native/interop.go b/pkg/core/native/interop.go
index fd02c6340..4fbcf2ffa 100644
--- a/pkg/core/native/interop.go
+++ b/pkg/core/native/interop.go
@@ -58,7 +58,7 @@ func Call(ic *interop.Context) error {
 		return fmt.Errorf("method %s not found", operation)
 	}
 	if !ic.VM.Context().GetCallFlags().Has(m.RequiredFlags) {
-		return errors.New("missing call flags")
+		return fmt.Errorf("missing call flags for native %s `%s` operation call: %05b vs %05b", name, operation, ic.VM.Context().GetCallFlags(), m.RequiredFlags)
 	}
 	if !ic.VM.AddGas(m.Price) {
 		return errors.New("gas limit exceeded")