diff --git a/lib/api/completeMultipartUpload.js b/lib/api/completeMultipartUpload.js
index 841e9839d1..69b1c1a194 100644
--- a/lib/api/completeMultipartUpload.js
+++ b/lib/api/completeMultipartUpload.js
@@ -367,13 +367,11 @@ function completeMultipartUpload(authInfo, request, log, callback) {
             // if x-scal-s3-version-id header is specified, we overwrite the object/version metadata.
             if (isPutVersion) {
                 const options = overwritingVersioning(objMD, metaStoreParams);
-                return process.nextTick(() => next(null, destBucket, dataLocations,
-                    metaStoreParams, mpuBucket, keysToDelete, aggregateETag,
-                    objMD, extraPartLocations, pseudoCipherBundle,
-                    completeObjData, options));
+                return process.nextTick(() => next(null, destBucket, extraPartLocations,
+                    dataLocations, metaStoreParams, mpuBucket, keysToDelete,
+                    aggregateETag, objMD, pseudoCipherBundle, completeObjData, options));
             }
-            return versioningPreprocessing(bucketName,
-                destBucket, objectKey, objMD, log, (err, options) => {
+            return versioningPreprocessing(bucketName, destBucket, objectKey, objMD, log, (err, options) => {
                     if (err) {
                         // TODO: check AWS error when user requested a specific
                         // version before any versions have been put
@@ -384,15 +382,31 @@ function completeMultipartUpload(authInfo, request, log, callback) {
                         });
                         return next(err, destBucket);
                     }
-                    return next(null, destBucket, dataLocations,
+                    return next(null, destBucket, extraPartLocations, dataLocations,
                         metaStoreParams, mpuBucket, keysToDelete, aggregateETag,
-                        objMD, extraPartLocations, pseudoCipherBundle,
-                        completeObjData, options);
+                        objMD, pseudoCipherBundle, completeObjData, options);
                 });
         },
-        function storeAsNewObj(destinationBucket, dataLocations,
-            metaStoreParams, mpuBucket, keysToDelete, aggregateETag, objMD,
-            extraPartLocations, pseudoCipherBundle,
+        function batchDeleteExtraParts(destinationBucket, extraPartLocations,
+            dataLocations, metaStoreParams, mpuBucket, keysToDelete,
+            aggregateETag, objMD, pseudoCipherBundle, completeObjData, options, next) {
+            if (extraPartLocations && extraPartLocations.length > 0) {
+                return data.batchDelete(extraPartLocations, request.method, null, log,
+                    err => {
+                        if (err) {
+                            return next(err);
+                        }
+                        return next(errors.InternalError.customizeDescription('test1'), destinationBucket,
+                            dataLocations, metaStoreParams, mpuBucket, keysToDelete,
+                            aggregateETag, objMD, extraPartLocations, pseudoCipherBundle, completeObjData, options);
+                    });
+            }
+            return next(null, destinationBucket, dataLocations, metaStoreParams,
+                mpuBucket, keysToDelete, aggregateETag, objMD, extraPartLocations, pseudoCipherBundle,
+                completeObjData, options);
+        },
+        function storeAsNewObj(destinationBucket, dataLocations, metaStoreParams,
+            mpuBucket, keysToDelete, aggregateETag, objMD, extraPartLocations, pseudoCipherBundle,
             completeObjData, options, next) {
             const dataToDelete = options.dataToDelete;
             /* eslint-disable no-param-reassign */
@@ -443,9 +457,7 @@ function completeMultipartUpload(authInfo, request, log, callback) {
                         uploadId: metaStoreParams.uploadId,
                     });
                     return next(null, mpuBucket, keysToDelete, aggregateETag,
-                        extraPartLocations, destinationBucket,
-                        // pass the original version ID as generatedVersionId
-                        objMD.versionId);
+                        extraPartLocations, destinationBucket, objMD.versionId);
                 }
             }
             return services.metadataStoreObject(destinationBucket.getName(),
@@ -474,42 +486,23 @@ function completeMultipartUpload(authInfo, request, log, callback) {
                         const newDataStoreName =
                             Array.isArray(dataLocations) && dataLocations[0] ?
                             dataLocations[0].dataStoreName : null;
-                        return data.batchDelete(dataToDelete,
-                            request.method,
+                        return data.batchDelete(dataToDelete, request.method,
                             newDataStoreName, log, err => {
                                 if (err) {
                                     return next(err);
                                 }
                                 return next(null, mpuBucket, keysToDelete,
-                                    aggregateETag, extraPartLocations,
-                                    destinationBucket, generatedVersionId);
+                                    aggregateETag, destinationBucket, generatedVersionId);
                             });
                     }
                     return next(null, mpuBucket, keysToDelete, aggregateETag,
-                        extraPartLocations, destinationBucket,
-                        generatedVersionId);
+                        destinationBucket, generatedVersionId);
                 });
         },
         function deletePartsMetadata(mpuBucket, keysToDelete, aggregateETag,
-            extraPartLocations, destinationBucket, generatedVersionId, next) {
-            services.batchDeleteObjectMetadata(mpuBucket.getName(),
-                keysToDelete, log, err => next(err, extraPartLocations,
-                    destinationBucket, aggregateETag, generatedVersionId));
-        },
-        function batchDeleteExtraParts(extraPartLocations, destinationBucket,
-            aggregateETag, generatedVersionId, next) {
-            if (extraPartLocations && extraPartLocations.length > 0) {
-                return data.batchDelete(extraPartLocations, request.method,
-                    null, log, err => {
-                        if (err) {
-                            return next(err);
-                        }
-                        return next(null, destinationBucket, aggregateETag,
-                            generatedVersionId);
-                    });
-            }
-            return next(null, destinationBucket, aggregateETag,
-                generatedVersionId);
+            destinationBucket, generatedVersionId, next) {
+            services.batchDeleteObjectMetadata(mpuBucket.getName(), keysToDelete, log,
+                err => next(err, destinationBucket, aggregateETag, generatedVersionId));
         },
     ], (err, destinationBucket, aggregateETag, generatedVersionId) => {
         const corsHeaders =