Autoinvoice Interface Line Error

 Hi,

We are on 11.5.10.2.

A return order generating a credit memo is interfaced to AR and it's erroring in Auto Invoice Interface with the following Message:  "Separate lines on the same credit memo cannot credit an invoice line more than once.".

I cannot find anything on Oracle Support pertaining to this message?  Why are the lines errorring?

The transaction in Order Management is in closed status.

The transaction that is errorring in auto invoice interface contains the amount for the item being returned and another line for a restocking fee charge.  Only credit memo transactions with a restock fee (charge) are erroring.   Thank you, Marie