Hi cbarrat, can you please send a screenshot of the bill, so I can understand how to assist?
You have the vendor credit on the books and you received a payment
deposit the payment and use the accounts payable/vendor name as the source account for the deposit
then use pay bills, select the "bill" the deposit created and apply the credit, save
thank you for the help i was misundestanding one instruction and selecteing the wrong account all sorted