Self Service "Edit Order" PO Charge Account Disabled

Summary:

We are exploring the use of Requester driven Change Orders via Manage Requisitions - Actions - Edit Order functionality.

A common use case would be the correction of segments in the Charge Account.

However, we are observing that if the PO has been partially invoiced, you cannot change the PO Charge Account. You can only split the distribution line and move over the portion of the qty/amount to new coding which has not been invoiced.

Is this by design?

Our hope is that by changing the accounting here, both the PO and the Invoice coding can be corrected automatically. We can have AP edit at the invoice level, but want to reflect upstream to the PO and reduce the work on the AP team ideally.