Joana,
Billing types assigned in order type configuration are the default billing types for order & delivery related billings. If you try to create a billing through VF01 you'll notice that if you don't select any billing type on VF01 screen then SAP automatically proposes what you've defined in the order type configuration.
But that doesn't imply that you can't create billing of any other types, as long you have correct setup of copy controls between source and target documents you should be able create billing of different type for same order/delivery type.
Yati








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