An export format or a method of payment with an export format must be specified.

An export format or a method of payment with an export format must be specified.

To resolve the error I had to move the current execution point from the CustVendSumForPaym class, constructor method,  "custVendSumForPaym.getLast();" line to avoid looking in the cache (SysLastValue) and retrieving a payment method format that does not exist.  I was asked to rename a file format method text that I had created, and had referenced this class during my testing.  I tried both clearing the cache and restarting the AOS but was unsuccessful attempting to remove the reference to the previously selected payment settings.

The source of my woes.

Edit: Not tried physically deleting the UAC (Ax User cache) file.