Import CM to clear Prepayments error with "An error occurred during processing of the field Reference Nbr.: Error: 'Reference Nbr.' cannot be found in the system."

Hello Everyone!

I’m trying to import credit memos to apply to prepayments and have created an import scenario but it doesn’t seem to work. I’ve search on the forum to try various solutions but I can’t seem to get this to work. Here is my import scenario and the error I’m receiving. 

Any advice would be greatly appreciated! Thank you!

I’ve also included the xml for the IS.  FYI, I use a similar IS to apply credit memos to refunds and it worked without any issues.