Error adding new crossReference on inventory

[SitterIT]

When trying to add a new crossReference on a inventory that already has one line with same alternateType, it throws an error on POST saying:

{"message":"Error inserting the cross-reference. Inventory Cross-reference with Alternate type: '0VPN' and Alternate ID: '5' has already been added."}

I want multiple references with same alternateID, but different bAccount. 

Payload: {"alternateType":{"value":"VPN"},"bAccount":{"value":"500009"},"alternateID":{"value":"5"},"description":{"value":"500009"}}

There's no problem doing it in the gui: ScreenId=IN202500

Doing it manually: