diff -r d0791faffa3f -r aabe5387f5ce mtpfws/mtpfw/src/cmtpobjectstore.cpp
--- a/mtpfws/mtpfw/src/cmtpobjectstore.cpp	Tue Feb 02 01:11:40 2010 +0200
+++ b/mtpfws/mtpfw/src/cmtpobjectstore.cpp	Fri Mar 19 09:40:39 2010 +0200
@@ -280,17 +280,23 @@
 
 void CMTPObjectStore::CommitReservedObjectHandleL(CMTPObjectMetaData& aObject)
 	{
+	TFileName suid;
+	suid.CopyLC(aObject.DesC(CMTPObjectMetaData::ESuid));
+	TUint32 handle = HandleL(suid);
+	if (handle != KMTPHandleNone)
+	    {
+	    __FLOG(_L8("CommitReserverd leave for duplicate suid."));
+	    User::Leave(KErrAlreadyExists);
+	    }
+	TUint32 suidHash = DefaultHash::Des16(suid);
+	
 	//After the PutL called the cursor's position is not well defined.
 	iCachedHandle = 0;
 	iCachedSuidHash = 0;
 	TInt64 id = iHandleAllocator->NextPOUIDL();
 	aObject.SetUint(CMTPObjectMetaData::EIdentifier, id);
 
-	TFileName suid;
-	suid.CopyLC(aObject.DesC(CMTPObjectMetaData::ESuid));
-	TUint32 suidHash = DefaultHash::Des16(suid);
-
-	TUint32 handle = aObject.Uint(CMTPObjectMetaData::EHandle);
+	handle = aObject.Uint(CMTPObjectMetaData::EHandle);
 	CleanupStack::PushL(TCleanupItem(CMTPObjectStore::DBUpdateFailRecover, &iBatched));
 	iBatched.InsertL();
 	iBatched.SetColL(EObjectStoreHandleId, handle);
@@ -385,6 +391,7 @@
 	TBool needToInsert = EFalse;
 	TBool needUpdateOwner = EFalse;
 	TUint dpId(aObject.Uint(CMTPObjectMetaData::EDataProviderId));
+
 	TFileName suid;
 	suid.CopyLC(aObject.DesC(CMTPObjectMetaData::ESuid));
 	TUint32 suidHash = DefaultHash::Des16(suid);
@@ -392,7 +399,7 @@
 	TUint32 handle = KMTPHandleNone, handleInDB = KMTPHandleAll;
 	TInt64 id = 0;
 	// Check if the dp is enumerating
-	if (iSingletons.DpController().EnumerateState() != CMTPDataProviderController::EEnumerated && iCacheExist)
+	if (iSingletons.DpController().EnumerateState() != CMTPDataProviderController::EEnumeratedFulllyCompleted && iCacheExist)
 		{
 		//it is in the object enumeration phase. 
 		// if it's see if we have an object with the same SUID
@@ -438,7 +445,8 @@
 				}
 			else
 				{
-				User::Leave(KErrAlreadyExists);
+				//while enumerating, we ignore the repeatedly INSERT operations.
+				//User::Leave(KErrAlreadyExists);
 				}
 			}
 		}
@@ -556,6 +564,14 @@
 
 	if (LocateByHandleL(handle))
 		{
+		//To avoid this modification will not generate duplicate SUID
+		TUint32 handle2 = HandleL(suid);
+		if (handle2 != KMTPHandleNone && handle2 != handle)
+		    {
+		    __FLOG(_L8("ModifyObjectL leave for duplicate suid."));
+		    User::Leave(KErrAlreadyExists); 
+		    }
+		
 		//After the PutL called the cursor's position is not well defined.
 		iCachedHandle = 0;
 		iCachedSuidHash = 0;
@@ -686,7 +702,7 @@
 	{
 	if (LocateByHandleL(aHandle.Value()))
 		{
-		if (iSingletons.DpController().EnumerateState() != CMTPDataProviderController::EEnumerated &&
+		if (iSingletons.DpController().EnumerateState() != CMTPDataProviderController::EEnumeratedFulllyCompleted &&
 			IsMediaFormat(iBatched.ColUint16(EObjectStoreFormatCode)))
 			{
 			iMtpDeltaDataMgr->UpdateDeltaDataTableL(iBatched.ColInt64(EObjectStorePOUID), CMtpDeltaDataMgr::EDeleted);
@@ -702,7 +718,7 @@
 	{
 	if(LocateBySuidL(aSuid))
 		{
-		if (iSingletons.DpController().EnumerateState() != CMTPDataProviderController::EEnumerated &&
+		if (iSingletons.DpController().EnumerateState() != CMTPDataProviderController::EEnumeratedFulllyCompleted &&
 			IsMediaFormat(iBatched_SuidHashID.ColUint16(EObjectStoreFormatCode)))
 			{
 			iMtpDeltaDataMgr->UpdateDeltaDataTableL(iBatched_SuidHashID.ColInt64(EObjectStorePOUID), CMtpDeltaDataMgr::EDeleted);