Po Variance account error on submitting the change order PO for approval

Summary:

User is trying to submit a change order PO for approval , encountered error message "The account PO variance account could not be determined (PO-2055355)".

Here are the detailed steps.

1) user opened the PO and click on Edit from Actions that created a change order.

2) Please note PO has one cancelled line (Line no 1) and one open line (Line no 2).

3) User navigated to distributions and click on Edit .Changed the requestor from "A" to "B" .

4) Click on submit button for approval. Application throwing error message "The account PO variance account could not be determined (PO-2055355)" for cancelled line no 1.

Please note i have tried rebuilding the accounts from the distributions but no luck.