Prenote

In E1 9.1, when we check prenote on supplier master bank and its unchecked on the Bank account info on Override Supplier Prenote, and if we write payment the very first time, system generates PK doc type for payment print process R04572T2. The subsequent ones would have payment doc type of PT. I am trying to understand:

1. When the payment is run for first time, system create PK payment doc type. Also it writes to F04572OW record. Does it tie back the record in F04572OW to the PK doc type?

2. System automatically removes the prenote from vendor master after first run. When will system start generating PT doc type subsequently? I think system doesnt generate PT doc type on subsequent run and continues with PK doc type if the Bank account information on supplier master is not entered or if it got changed.