After posting that's exactly what I tried. I manually created another invoice number (#2103). Then I returned to automatic numbering to created another invoice....
This process does not work. I have enabled custom invoice numbers, and created a series of invoices by typing in the invoice number manually.:Next time I create...
This process does not work. As you see here, I enabled custom invoice numbers, created a sequence (2100-2102), then disabled customised numbers. The next invoic...
