Hi Tom,
Sorry, You don't have the option to select form for the program RFFOAVIS variant since it is only for zero balance notifications. You will have this option only for RFFOJP_T.
I am not sure why you are using RFFOAVIS in your config. You need to use RFFOJP_T in OBVCU.
RFFOAVIS - The program creates notifications for customers/vendors that their receivables and payables balance to zero
RFFOUS_C or RFFOJP_T– Program prints prenumbered check forms or non-prenumbered checks whose number is to be assigned from a predefined number range, and links the check number to SAP payment document number or the check number to the settlement result. In addition to the checks, you can print their payment advice notes and payment summaries in one program run.
Regards,
Prasad