Why does writing an ACH payment call the payment number from P0030G, but not use it?

Hi

I'm using JDE E1 9.2

We use automatic payment processing and electronic payment processing for our supplier payments.

Automatic payment processing generates PK document types and retrieves the next number from the P0030G.

When writing the payment, the next number can be updated at the 'write' screen.

Electronic payments (ACH) generate PT documents, and the numbers are retrieved from the P0002, Next Number by Co/Fiscal Year.

Oracle have confirmed that PT documents do not use the next numbers from P0030G, they can only use next numbers from the P0002.

However, when writing an ACH payment, the 'write' screen initially retrieves the payment number from the P0030G (displaying it on the screen and allowing it to be overwritten) but it doesn't actually use this number to generate the payment numbers. It uses the numbers from P0002. This can only be seen after the payment has been written.