Accounts Payable Custom AP Register

We have created a custom AP Register.  Added to 04/PR the P5604576 .  Have updated the pay instrument "Payment Register" to be P5604576 and version XXXX0001.

Following the process, in Work With Auto Payment Groups, we "write" and get all reports, then we "update" and get the custom AP Register Report but the batch type K does not create nor does the group get updated and removed.

If I remove the "P5604576 from the pay instrument and put back the P04576.......everything works as it should!!

Any help is greatly appreciated!