I am reply to this old post because I came across the same situation. I resolved this through a config change. The table that holds this config is T021R. IMG path is: Financial Accounting > Accounts Receivable and Accounts Payable > Business Transactions > Outgoing Payments > Manual Outgoing Payments > Make Settings for Processing Open Items > (execute) 'Choose Selection Fields'. Next screen select the field you want to add to the 'Additional Selections' list. The field text comes from RFOPS, so make sure structure RFOPS contains your new field.
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