You have a known problem since the last major update 4 months ago! FIX IT! I made a partial payment. Went back to that invoice to make another payment. Says zero bal due and no way to make another payment. Had to phone my vendor. She had to create a dummy invoice so I can pay it, then she has to void it and move the payment back to the original invoice, as directed by Intuit until problem is fixed! Very unproductive, and good reason not to use this system!