I'm not an accountant or bookkeeper, but I have been using Gnucash to enter and manage my invoices. I had an instance where I used B192116 for an invoice number and the customer paid this invoice. A month later there was some confusion and I re-entered the same invoice number B192116 for the same customer and Gnucash took it no problem. Is there a way for Gnucash to warn or stop me from entering duplicate invoices?
32.8k 19 19 gold badges 87 87 silver badges 145 145 bronze badges asked Oct 19, 2016 at 21:27 ray hairston ray hairston 31 1 1 bronze badgeI'm not familiar with Gnucash, and I'm not an accountant, but I think the program would almost have to allow for multiple payments against an invoice, so that you can track partial payments. By the same token there should be a way to mark an invoice as paid in full, or to close the invoice to further transactions.
Commented Oct 20, 2016 at 17:22When I hit this problem, the solution that worked for me (on Gnucash 3.4) was to use automatic invoice numbering.
When I create a new invoice, I simply leave the invoice number blank, and Gnucash chooses the next invoice number in the sequence.
To set the current number in the sequence, choose File / Properties from the main menu. Then choose the Counters tab. Scroll down to invoices and set the current number. The next invoice you generate will have a number one greater than this.