Payment Worksheet is not populating Write Off Amount for WAU / WAO type

Product - PeopleSoft FIN Account Receivable 9.2 - Image 33 (9.2.33)

Scenario - Write Off an Underpayment

There are multiple ways to do it -

1) using the Entry Type - WO - this is working fine. When the payment worksheet is saved, Write Off amount is populated and Worksheet is going for approval

2) Using Entry Type - WAU - As using WO is not the only method it is a concern.

Example - 98 USD of payment is applied to 100 USD Invoice using manual payment worksheet. Then using + button or Add with detail, a new item is create with Entry Type WAU for this remaining 2 dollars.