For your requirement I would suggest you to do this,
Keep the MBO you need to get the updated data in a separate Sync group say "Dynamic". Once you update data to SAP you can update a particular MBO values by calling a sync to only this newly created Sync group. Hence the old data in the MBO will be overwrited and you will get the fresh data.
ex:
CocoaGhanaDB.synchronize("Dynamic");
