Solution : https://service.sap.com/sap/support/notes/184451 (SAP Service marketplace login required)
Key words :
additional key words co01, additional valid receivers, message class c2, automatic settlement rule, existing order type, settlement profile</> approach, settlement rule manually, 'settlement rule, settlement rule -, receivers allowed
Related Notes :
305107 | Not possible to create a settlement rule |
301035 | CO07: Settlement rule for sales order |
76990 | Required receiver not used in settlement profile |