I've gone to the Company Profile tab in AP and ticked the Alphanumeric manual check numbers? box.
So when I go to do a manual payment I can now put letters in as well, however what I am really trying to do is differentiate this payment stream by prefixing it with a letter or letters.
I thought maybe I could go to the Series tab of Edit Banks and put the prefix in the Next check box, but seemingly no...
Am I missing an easy way to get my manual payments to go A001, A002, A003...?
Thanks for your thoughts!

You could hard code the "A" into the cheque spec.

Interesting idea! However I'm actually just trying to get my EFT payments to look different than my cheques in the GL so there's nothing being printed.

The EFT add-on automatically numbers each EFT payment with a prefix of EFT and a sequence number. This would give you what you're asking.

OK, good to know! We have until recently only had a few EFT vendors so we have been entering them manually into our bank rather than using the Adagio piece, but I guess this is a good reason to see if we can figure out how it works!
Thanks!