Notes on Clearing Dates
On the whole, the payment date is used as the clearing date. There exist, however, the following exceptions.
Items whose posting date comes after the posting date of the payment run will be paid, provided they are already due.
The clearing date for such payments is not the payment date, but rather the latest posting date possible. Thus any danger of the clearing date coming before the posting date is prevented in the context of paid items. Errors are avoided in this way.