Minimal steps to update distribution accounts on encumbered PO in PBWC

In BWC the user is using Change amount action to change charge account.

The user followed these steps in BWC:

1. Create a new PO in BWC with a line and approve the PO

2. Query the PO created at step 1 on which charge account has to be changed

2. Click on change amount action

3. Make the existing distribution quantity to 0

4. Add a new distribution with a new charge account and quantity 10

Research:

I searched more in details about this issue and I found this Bug 20826680 - NOT ABLE TO UPDATE PROJECT DETAILS IN APPROVED COMPLEX PURCHASE ORDER

In this BUG Development team told that: