Override feed, duplicate parent ids

I am trying to create a Facebook Override feed for a country e.g. US. I have a primary feed which is fine. When creating the override feed I changed the product id to WPML, c changed currency and added the override attribute.

I am getting an error from the Facebook commerce manager saying:

“These items have the same ID and override. Remove any duplicate entries, then try uploading your file again”

This error is for ALL feed items. All items have “<g:id>parent_id</g:id>”

and

“The ID doesn’t match an existing item ID in your catalog. Check this information and try uploading your items again.”

Can’t see what is wrong.