I think i’ve found a bug.
None of the invoice numbers are showing up. I assume this is a bug, but I may also be doing something wrong…
It also seems that no matter which one I select, the most recent invoice is always chosen to apply the payment to.
For one of those invoices listed with a # can you post a screenshot of the top half, including Invoice number.
Oh wow now I feel stupid 
None of the purchase invoices are numbered. Is there a way to have manager auto increment a number each time an invoice is created? I just assumed that it did that as it does with sales invoices. Or should that field be used to put in the suppliers invoice #
Yes