When an invoice is reprinted, the discount terms recalculate the "received by" date for the date reprinted instead of the acutal invoice date.
 
Example:  Inv #1 has an invoice date of 6/1/08.  Discount terms are "2% when paid by 7/10/08".
When Inv #1 is reprinted on 8/22/08 the discount terms now print "2% when paid by 9/10/08".
 
How can we keep the discount terms to calculate on the original ship date when reprinting?
 
Thanks

Yes, the invoice has been posted.