Hi Ravi,
1. In OBA3 I have sent Zero "0" Amount , Percent and Adjust Discount By under Permitted Payment Difference.
2. In OBA4 gave Zero "0" percent allow under Permitted Payment difference.
But still allowing to post GL while using change of diff and Back arrow.
As you suggested above let me know detailed T.code details for maintain the Reason code to GL and complete configuration steps for achieve the requirement.
Regards,
Babu.