I have the mapping in my FDM application. And now I need to change this mapping for some accounts, but then I load new mapping (via Maploader.xls) it makes no change to the existing accounts, just add the mapping for new accounts. How can I update the mapping for existing accounts?
The Map Loader will not make changes to existing accounts, it will only append to your current mapping table and new records. If you want to make changes, you would need to delete the current mapping table and upload the new mapping table with the updated records.
You can export the current maps to XLS for a backup prior to deleting.