Set this to true if this mandate is already known by the bank. This is for example a good option if you're migrating a lot of mandates that you know are already active. The actual outcome of using this flag depends on the direct debit scheme, since all schemes work in slightly different ways. For example, for AUTOGIRO, it means that Atlar won't send the mandate prior to making the collection. For other schemes, it could have an effect on how quickly the collection can be executed.