Keywords: 
Dear developers,
Kindly note that for bulk payments, if the PSU prefers to have individual bookings viewed as one transaction, we highly recommend providing the batchBookingPreferred flag and setting it to “true”. In case the PSUs’ prefers individual bookings of all contained individual transactions, then you should put the flag to “false”. This way, we will be able to follow the exact preference of the PSU.
Your Commerzbank Support-Team