Financial and / or Payroll : Unbalanced ACH file

We are currently on Xe, coming up to 9.1 in September. Several years ago, our bank required our ACH file to be balanced. I made the change somewhere to accommodate that. I can't recall where we made that change. And it was either to the payroll ACH or the AP ACH or both. Now, the bank has merged with another and they require an UNbalanced ACH file. Can you help me (recall) on where to change this? CAN it be changed? I saw something on 1384875.1 that seemed to indicate we can only do balanced files.