You can't change the receipt method. (AR-856575)

Summary:

I'm trying to change Receipt Method on the standard field (Show more > Payment > Receipt Method) in a AR invoice. It doesn't allow me to change it if the invoice is complete.

I tried also with an Incomplete Invoice but the field disappeared. For a test that I'm performing I need the field to be changed directly in Oracle and not in interface table.

Other relevant information:

• Payment Method avaiable in both account site and bill to site customer master data. This information has been added after the import of the invoice;
• the Payment Method that we need to add is an automatic one but we also tried with a standard one and the error still remains.