I'd like to make one further point that may not have been clear in my original post. The deduction for prepayment is not the issue as this was arranged as part of the L/C. The issue is that the invoice has an attestation on the back that quotes the invoice value ($317,000.00) instead of the value of...

An LC from Nigeria required the following document: "ONE ATTESTED ORIGINAL AND AT LEAST ONE COPY OF FINAL INVOICE WITH DESCRIPTION OF GOODS. THE ORIGINAL TO BE DULY ENDORSED AND AFFIXED WITH THE SECURITY LABEL/SEAL OF SWEDE CONTROL/ INTERTEK, ITS AGENT OR AFFILIATE, BEARING THE CLEAN REPORT OF ...