diff --git a/api/errors/errors.go b/api/errors/errors.go
index 1ce4d0d..47822e1 100644
--- a/api/errors/errors.go
+++ b/api/errors/errors.go
@@ -3,6 +3,8 @@ package errors
 import (
 	"fmt"
 	"net/http"
+
+	frosterrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
 )
 
 type (
@@ -1700,6 +1702,7 @@ var errorCodes = errorCodeMap{
 
 // IsS3Error checks if the provided error is a specific s3 error.
 func IsS3Error(err error, code ErrorCode) bool {
+	err = frosterrors.UnwrapErr(err)
 	e, ok := err.(Error)
 	return ok && e.ErrCode == code
 }
diff --git a/api/handler/acl.go b/api/handler/acl.go
index 5e6c2e9..65c3b6e 100644
--- a/api/handler/acl.go
+++ b/api/handler/acl.go
@@ -507,7 +507,7 @@ func checkOwner(info *data.BucketInfo, owner string) error {
 
 	// may need to convert owner to appropriate format
 	if info.Owner.String() != owner {
-		return errors.GetAPIError(errors.ErrAccessDenied)
+		return fmt.Errorf("%w: mismatch owner", errors.GetAPIError(errors.ErrAccessDenied))
 	}
 
 	return nil
diff --git a/api/handler/acl_test.go b/api/handler/acl_test.go
index f3c877c..b91960d 100644
--- a/api/handler/acl_test.go
+++ b/api/handler/acl_test.go
@@ -11,10 +11,12 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
@@ -1480,9 +1482,14 @@ func createAccessBox(t *testing.T) (*accessbox.Box, *keys.PrivateKey) {
 
 	tok := new(session.Container)
 	tok.ForVerb(session.VerbContainerSetEACL)
+	err = tok.Sign(key.PrivateKey)
+	require.NoError(t, err)
 
 	tok2 := new(session.Container)
 	tok2.ForVerb(session.VerbContainerPut)
+	err = tok2.Sign(key.PrivateKey)
+	require.NoError(t, err)
+
 	box := &accessbox.Box{
 		Gate: &accessbox.GateData{
 			SessionTokens: []*session.Container{tok, tok2},
@@ -1493,18 +1500,28 @@ func createAccessBox(t *testing.T) (*accessbox.Box, *keys.PrivateKey) {
 	return box, key
 }
 
-func createBucket(t *testing.T, tc *handlerContext, bktName string, box *accessbox.Box) *data.BucketInfo {
-	w, r := prepareTestRequest(tc, bktName, "", nil)
-	ctx := context.WithValue(r.Context(), api.BoxData, box)
-	r = r.WithContext(ctx)
-	tc.Handler().CreateBucketHandler(w, r)
+func createBucket(t *testing.T, hc *handlerContext, bktName string, box *accessbox.Box) *data.BucketInfo {
+	w := createBucketBase(hc, bktName, box)
 	assertStatus(t, w, http.StatusOK)
 
-	bktInfo, err := tc.Layer().GetBucketInfo(tc.Context(), bktName)
+	bktInfo, err := hc.Layer().GetBucketInfo(hc.Context(), bktName)
 	require.NoError(t, err)
 	return bktInfo
 }
 
+func createBucketAssertS3Error(hc *handlerContext, bktName string, box *accessbox.Box, code s3errors.ErrorCode) {
+	w := createBucketBase(hc, bktName, box)
+	assertS3Error(hc.t, w, s3errors.GetAPIError(code))
+}
+
+func createBucketBase(hc *handlerContext, bktName string, box *accessbox.Box) *httptest.ResponseRecorder {
+	w, r := prepareTestRequest(hc, bktName, "", nil)
+	ctx := context.WithValue(r.Context(), api.BoxData, box)
+	r = r.WithContext(ctx)
+	hc.Handler().CreateBucketHandler(w, r)
+	return w
+}
+
 func putBucketACL(t *testing.T, tc *handlerContext, bktName string, box *accessbox.Box, header map[string]string) {
 	w, r := prepareTestRequest(tc, bktName, "", nil)
 	for key, val := range header {
diff --git a/api/handler/delete_test.go b/api/handler/delete_test.go
index 7c5160c..947ef3f 100644
--- a/api/handler/delete_test.go
+++ b/api/handler/delete_test.go
@@ -3,6 +3,7 @@ package handler
 import (
 	"bytes"
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"testing"
 
@@ -431,31 +432,28 @@ func deleteBucket(t *testing.T, tc *handlerContext, bktName string, code int) {
 	assertStatus(t, w, code)
 }
 
-func checkNotFound(t *testing.T, tc *handlerContext, bktName, objName, version string) {
-	query := make(url.Values)
-	query.Add(api.QueryVersionID, version)
-
-	w, r := prepareTestFullRequest(tc, bktName, objName, query, nil)
-	tc.Handler().HeadObjectHandler(w, r)
+func checkNotFound(t *testing.T, hc *handlerContext, bktName, objName, version string) {
+	w := headObjectBase(hc, bktName, objName, version)
 	assertStatus(t, w, http.StatusNotFound)
 }
 
 func headObjectAssertS3Error(hc *handlerContext, bktName, objName, version string, code apiErrors.ErrorCode) {
+	w := headObjectBase(hc, bktName, objName, version)
+	assertS3Error(hc.t, w, apiErrors.GetAPIError(code))
+}
+
+func checkFound(t *testing.T, hc *handlerContext, bktName, objName, version string) {
+	w := headObjectBase(hc, bktName, objName, version)
+	assertStatus(t, w, http.StatusOK)
+}
+
+func headObjectBase(hc *handlerContext, bktName, objName, version string) *httptest.ResponseRecorder {
 	query := make(url.Values)
 	query.Add(api.QueryVersionID, version)
 
 	w, r := prepareTestFullRequest(hc, bktName, objName, query, nil)
 	hc.Handler().HeadObjectHandler(w, r)
-	assertS3Error(hc.t, w, apiErrors.GetAPIError(code))
-}
-
-func checkFound(t *testing.T, tc *handlerContext, bktName, objName, version string) {
-	query := make(url.Values)
-	query.Add(api.QueryVersionID, version)
-
-	w, r := prepareTestFullRequest(tc, bktName, objName, query, nil)
-	tc.Handler().HeadObjectHandler(w, r)
-	assertStatus(t, w, http.StatusOK)
+	return w
 }
 
 func listVersions(t *testing.T, tc *handlerContext, bktName string) *ListObjectsVersionsResponse {
diff --git a/api/handler/put_test.go b/api/handler/put_test.go
index 044a0fa..d65c365 100644
--- a/api/handler/put_test.go
+++ b/api/handler/put_test.go
@@ -16,7 +16,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
 	v4 "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"github.com/aws/aws-sdk-go/aws/credentials"
@@ -166,7 +166,7 @@ func TestPutObjectWithStreamBodyError(t *testing.T) {
 	r.Header.Set(api.AmzContentSha256, api.StreamingContentSHA256)
 	r.Header.Set(api.ContentEncoding, api.AwsChunked)
 	tc.Handler().PutObjectHandler(w, r)
-	assertS3Error(t, w, errors.GetAPIError(errors.ErrMissingContentLength))
+	assertS3Error(t, w, s3errors.GetAPIError(s3errors.ErrMissingContentLength))
 
 	checkNotFound(t, tc, bktName, objName, emptyVersion)
 }
@@ -239,3 +239,15 @@ func TestPutObjectWithStreamBodyAWSExample(t *testing.T) {
 		require.Equal(t, chunk[i], data[i])
 	}
 }
+
+func TestCreateBucket(t *testing.T) {
+	hc := prepareHandlerContext(t)
+	bktName := "bkt-name"
+
+	box, _ := createAccessBox(t)
+	createBucket(t, hc, bktName, box)
+	createBucketAssertS3Error(hc, bktName, box, s3errors.ErrBucketAlreadyOwnedByYou)
+
+	box2, _ := createAccessBox(t)
+	createBucketAssertS3Error(hc, bktName, box2, s3errors.ErrBucketAlreadyExists)
+}
diff --git a/api/layer/compound.go b/api/layer/compound.go
index 4ac4a6f..8f32202 100644
--- a/api/layer/compound.go
+++ b/api/layer/compound.go
@@ -2,10 +2,11 @@ package layer
 
 import (
 	"context"
-	errorsStd "errors"
+	"errors"
+	"fmt"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 )
 
 func (n *layer) GetObjectTaggingAndLock(ctx context.Context, objVersion *ObjectVersion, nodeVersion *data.NodeVersion) (map[string]string, *data.LockInfo, error) {
@@ -28,8 +29,8 @@ func (n *layer) GetObjectTaggingAndLock(ctx context.Context, objVersion *ObjectV
 
 	tags, lockInfo, err = n.treeService.GetObjectTaggingAndLock(ctx, objVersion.BktInfo, nodeVersion)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return nil, nil, err
 	}
diff --git a/api/layer/container.go b/api/layer/container.go
index e4c5b13..b765723 100644
--- a/api/layer/container.go
+++ b/api/layer/container.go
@@ -8,7 +8,7 @@ import (
 	v2container "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
@@ -43,10 +43,8 @@ func (n *layer) containerInfo(ctx context.Context, idCnr cid.ID) (*data.BucketIn
 	)
 	res, err = n.frostFS.Container(ctx, idCnr)
 	if err != nil {
-		log.Error("could not fetch container", zap.Error(err))
-
 		if client.IsErrContainerNotFound(err) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchBucket)
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchBucket), err.Error())
 		}
 		return nil, fmt.Errorf("get frostfs container: %w", err)
 	}
diff --git a/api/layer/cors.go b/api/layer/cors.go
index 25b02b0..2d6b6e4 100644
--- a/api/layer/cors.go
+++ b/api/layer/cors.go
@@ -73,7 +73,7 @@ func (n *layer) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (*d
 	cors, err := n.getCORS(ctx, bktInfo)
 	if err != nil {
 		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchCORSConfiguration)
+			return nil, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchCORSConfiguration), err.Error())
 		}
 		return nil, err
 	}
diff --git a/api/layer/layer.go b/api/layer/layer.go
index 693df0f..7c28d4c 100644
--- a/api/layer/layer.go
+++ b/api/layer/layer.go
@@ -361,7 +361,7 @@ func (n *layer) GetBucketInfo(ctx context.Context, name string) (*data.BucketInf
 	containerID, err := n.ResolveBucket(ctx, name)
 	if err != nil {
 		if strings.Contains(err.Error(), "not found") {
-			return nil, errors.GetAPIError(errors.ErrNoSuchBucket)
+			return nil, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchBucket), err.Error())
 		}
 		return nil, err
 	}
diff --git a/api/layer/multipart_upload.go b/api/layer/multipart_upload.go
index 3807c82..b453269 100644
--- a/api/layer/multipart_upload.go
+++ b/api/layer/multipart_upload.go
@@ -3,7 +3,7 @@ package layer
 import (
 	"context"
 	"encoding/hex"
-	stderrors "errors"
+	"errors"
 	"fmt"
 	"io"
 	"sort"
@@ -12,7 +12,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
@@ -174,14 +174,14 @@ func (n *layer) CreateMultipartUpload(ctx context.Context, p *CreateMultipartPar
 func (n *layer) UploadPart(ctx context.Context, p *UploadPartParams) (string, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Info.Bkt, p.Info.Key, p.Info.UploadID)
 	if err != nil {
-		if stderrors.Is(err, ErrNodeNotFound) {
-			return "", errors.GetAPIError(errors.ErrNoSuchUpload)
+		if errors.Is(err, ErrNodeNotFound) {
+			return "", fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchUpload), err.Error())
 		}
 		return "", err
 	}
 
 	if p.Size > uploadMaxSize {
-		return "", errors.GetAPIError(errors.ErrEntityTooLarge)
+		return "", fmt.Errorf("%w: %d/%d", s3errors.GetAPIError(s3errors.ErrEntityTooLarge), p.Size, uploadMaxSize)
 	}
 
 	objInfo, err := n.uploadPart(ctx, multipartInfo, p)
@@ -196,7 +196,7 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 	if err := p.Info.Encryption.MatchObjectEncryption(encInfo); err != nil {
 		n.reqLogger(ctx).Warn("mismatched obj encryptionInfo", zap.Error(err))
-		return nil, errors.GetAPIError(errors.ErrInvalidEncryptionParameters)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidEncryptionParameters)
 	}
 
 	bktInfo := p.Info.Bkt
@@ -246,7 +246,7 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 	}
 
 	oldPartID, err := n.treeService.AddPart(ctx, bktInfo, multipartInfo.ID, partInfo)
-	oldPartIDNotFound := stderrors.Is(err, ErrNoNodeToRemove)
+	oldPartIDNotFound := errors.Is(err, ErrNoNodeToRemove)
 	if err != nil && !oldPartIDNotFound {
 		return nil, err
 	}
@@ -275,8 +275,8 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 func (n *layer) UploadPartCopy(ctx context.Context, p *UploadCopyParams) (*data.ObjectInfo, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Info.Bkt, p.Info.Key, p.Info.UploadID)
 	if err != nil {
-		if stderrors.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchUpload)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchUpload), err.Error())
 		}
 		return nil, err
 	}
@@ -285,11 +285,11 @@ func (n *layer) UploadPartCopy(ctx context.Context, p *UploadCopyParams) (*data.
 	if p.Range != nil {
 		size = p.Range.End - p.Range.Start + 1
 		if p.Range.End > p.SrcObjInfo.Size {
-			return nil, errors.GetAPIError(errors.ErrInvalidCopyPartRangeSource)
+			return nil, fmt.Errorf("%w: %d-%d/%d", s3errors.GetAPIError(s3errors.ErrInvalidCopyPartRangeSource), p.Range.Start, p.Range.End, p.SrcObjInfo.Size)
 		}
 	}
 	if size > uploadMaxSize {
-		return nil, errors.GetAPIError(errors.ErrEntityTooLarge)
+		return nil, fmt.Errorf("%w: %d/%d", s3errors.GetAPIError(s3errors.ErrEntityTooLarge), size, uploadMaxSize)
 	}
 
 	pr, pw := io.Pipe()
@@ -333,7 +333,7 @@ type multiObjectReader struct {
 func (x *multiObjectReader) Read(p []byte) (n int, err error) {
 	if x.curReader != nil {
 		n, err = x.curReader.Read(p)
-		if !stderrors.Is(err, io.EOF) {
+		if !errors.Is(err, io.EOF) {
 			return n, err
 		}
 	}
@@ -359,7 +359,7 @@ func (x *multiObjectReader) Read(p []byte) (n int, err error) {
 func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipartParams) (*UploadData, *data.ExtendedObjectInfo, error) {
 	for i := 1; i < len(p.Parts); i++ {
 		if p.Parts[i].PartNumber <= p.Parts[i-1].PartNumber {
-			return nil, nil, errors.GetAPIError(errors.ErrInvalidPartOrder)
+			return nil, nil, s3errors.GetAPIError(s3errors.ErrInvalidPartOrder)
 		}
 	}
 
@@ -370,7 +370,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 
 	if len(partsInfo) < len(p.Parts) {
-		return nil, nil, errors.GetAPIError(errors.ErrInvalidPart)
+		return nil, nil, fmt.Errorf("%w: found %d parts, need %d", s3errors.GetAPIError(s3errors.ErrInvalidPart), len(partsInfo), len(p.Parts))
 	}
 
 	var multipartObjetSize uint64
@@ -381,11 +381,11 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 	for i, part := range p.Parts {
 		partInfo := partsInfo[part.PartNumber]
 		if partInfo == nil || part.ETag != partInfo.ETag {
-			return nil, nil, errors.GetAPIError(errors.ErrInvalidPart)
+			return nil, nil, fmt.Errorf("%w: unknown part %d or etag mismatched", s3errors.GetAPIError(s3errors.ErrInvalidPart), part.PartNumber)
 		}
 		// for the last part we have no minimum size limit
 		if i != len(p.Parts)-1 && partInfo.Size < uploadMinSize {
-			return nil, nil, errors.GetAPIError(errors.ErrEntityTooSmall)
+			return nil, nil, fmt.Errorf("%w: %d/%d", s3errors.GetAPIError(s3errors.ErrEntityTooSmall), partInfo.Size, uploadMinSize)
 		}
 		parts = append(parts, partInfo)
 		multipartObjetSize += partInfo.Size // even if encryption is enabled size is actual (decrypted)
@@ -455,7 +455,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 			zap.String("uploadKey", p.Info.Key),
 			zap.Error(err))
 
-		return nil, nil, errors.GetAPIError(errors.ErrInternalError)
+		return nil, nil, s3errors.GetAPIError(s3errors.ErrInternalError)
 	}
 
 	var addr oid.Address
@@ -559,7 +559,7 @@ func (n *layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 	if err = p.Info.Encryption.MatchObjectEncryption(encInfo); err != nil {
 		n.reqLogger(ctx).Warn("mismatched obj encryptionInfo", zap.Error(err))
-		return nil, errors.GetAPIError(errors.ErrInvalidEncryptionParameters)
+		return nil, s3errors.GetAPIError(s3errors.ErrInvalidEncryptionParameters)
 	}
 
 	res.Owner = multipartInfo.Owner
@@ -602,8 +602,8 @@ func (n *layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 func (n *layer) getUploadParts(ctx context.Context, p *UploadInfoParams) (*data.MultipartInfo, map[int]*data.PartInfo, error) {
 	multipartInfo, err := n.treeService.GetMultipartUpload(ctx, p.Bkt, p.Key, p.UploadID)
 	if err != nil {
-		if stderrors.Is(err, ErrNodeNotFound) {
-			return nil, nil, errors.GetAPIError(errors.ErrNoSuchUpload)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchUpload), err.Error())
 		}
 		return nil, nil, err
 	}
diff --git a/api/layer/object.go b/api/layer/object.go
index 95f7b9d..0473006 100644
--- a/api/layer/object.go
+++ b/api/layer/object.go
@@ -308,13 +308,13 @@ func (n *layer) headLastVersionIfNotDeleted(ctx context.Context, bkt *data.Bucke
 	node, err := n.treeService.GetLatestVersion(ctx, bkt, objectName)
 	if err != nil {
 		if errors.Is(err, ErrNodeNotFound) {
-			return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchKey)
+			return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchKey), err.Error())
 		}
 		return nil, err
 	}
 
 	if node.IsDeleteMarker() {
-		return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchKey)
+		return nil, fmt.Errorf("%w: found version is delete marker", apiErrors.GetAPIError(apiErrors.ErrNoSuchKey))
 	}
 
 	meta, err := n.objectHead(ctx, bkt, node.OID)
@@ -343,7 +343,7 @@ func (n *layer) headVersion(ctx context.Context, bkt *data.BucketInfo, p *HeadOb
 		foundVersion, err = n.treeService.GetUnversioned(ctx, bkt, p.Object)
 		if err != nil {
 			if errors.Is(err, ErrNodeNotFound) {
-				return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion)
+				return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion), err.Error())
 			}
 			return nil, err
 		}
@@ -360,7 +360,7 @@ func (n *layer) headVersion(ctx context.Context, bkt *data.BucketInfo, p *HeadOb
 			}
 		}
 		if foundVersion == nil {
-			return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion)
+			return nil, fmt.Errorf("%w: there isn't tree node with requested version id", apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion))
 		}
 	}
 
@@ -372,7 +372,7 @@ func (n *layer) headVersion(ctx context.Context, bkt *data.BucketInfo, p *HeadOb
 	meta, err := n.objectHead(ctx, bkt, foundVersion.OID)
 	if err != nil {
 		if client.IsErrObjectNotFound(err) {
-			return nil, apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion)
+			return nil, fmt.Errorf("%w: %s", apiErrors.GetAPIError(apiErrors.ErrNoSuchVersion), err.Error())
 		}
 		return nil, err
 	}
diff --git a/api/layer/system_object.go b/api/layer/system_object.go
index 0563341..b5500d8 100644
--- a/api/layer/system_object.go
+++ b/api/layer/system_object.go
@@ -167,7 +167,7 @@ func (n *layer) getCORS(ctx context.Context, bkt *data.BucketInfo) (*data.CORSCo
 	}
 
 	if objIDNotFound {
-		return nil, errors.GetAPIError(errors.ErrNoSuchCORSConfiguration)
+		return nil, fmt.Errorf("%w: %s", errors.GetAPIError(errors.ErrNoSuchCORSConfiguration), err.Error())
 	}
 
 	obj, err := n.objectGet(ctx, bkt, objID)
diff --git a/api/layer/tagging.go b/api/layer/tagging.go
index a1144d3..ff399f6 100644
--- a/api/layer/tagging.go
+++ b/api/layer/tagging.go
@@ -2,10 +2,11 @@ package layer
 
 import (
 	"context"
-	errorsStd "errors"
+	"errors"
+	"fmt"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
@@ -52,8 +53,8 @@ func (n *layer) GetObjectTagging(ctx context.Context, p *GetObjectTaggingParams)
 
 	tags, err := n.treeService.GetObjectTagging(ctx, p.ObjectVersion.BktInfo, nodeVersion)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return "", nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return "", nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return "", nil, err
 	}
@@ -75,8 +76,8 @@ func (n *layer) PutObjectTagging(ctx context.Context, p *PutObjectTaggingParams)
 
 	err = n.treeService.PutObjectTagging(ctx, p.ObjectVersion.BktInfo, nodeVersion, p.TagSet)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return nil, err
 	}
@@ -94,8 +95,8 @@ func (n *layer) DeleteObjectTagging(ctx context.Context, p *ObjectVersion) (*dat
 
 	err = n.treeService.DeleteObjectTagging(ctx, p.BktInfo, version)
 	if err != nil {
-		if errorsStd.Is(err, ErrNodeNotFound) {
-			return nil, errors.GetAPIError(errors.ErrNoSuchKey)
+		if errors.Is(err, ErrNodeNotFound) {
+			return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 		}
 		return nil, err
 	}
@@ -115,7 +116,7 @@ func (n *layer) GetBucketTagging(ctx context.Context, bktInfo *data.BucketInfo)
 	}
 
 	tags, err := n.treeService.GetBucketTagging(ctx, bktInfo)
-	if err != nil && !errorsStd.Is(err, ErrNodeNotFound) {
+	if err != nil && !errors.Is(err, ErrNodeNotFound) {
 		return nil, err
 	}
 
@@ -168,12 +169,14 @@ func (n *layer) getNodeVersion(ctx context.Context, objVersion *ObjectVersion) (
 			}
 		}
 		if version == nil {
-			err = errors.GetAPIError(errors.ErrNoSuchVersion)
+			err = fmt.Errorf("%w: there isn't tree node with requested version id", s3errors.GetAPIError(s3errors.ErrNoSuchVersion))
 		}
 	}
 
-	if err == nil && version.IsDeleteMarker() && !objVersion.NoErrorOnDeleteMarker || errorsStd.Is(err, ErrNodeNotFound) {
-		return nil, errors.GetAPIError(errors.ErrNoSuchKey)
+	if err == nil && version.IsDeleteMarker() && !objVersion.NoErrorOnDeleteMarker {
+		return nil, fmt.Errorf("%w: found version is delete marker", s3errors.GetAPIError(s3errors.ErrNoSuchKey))
+	} else if errors.Is(err, ErrNodeNotFound) {
+		return nil, fmt.Errorf("%w: %s", s3errors.GetAPIError(s3errors.ErrNoSuchKey), err.Error())
 	}
 
 	if err == nil && version != nil && !version.IsDeleteMarker() {