Updating charge account in Release and Standard PO

We keep on creating new GL code combinations and disable old ones. We are having issues when a code which is disabled in a release or a PO line and we need to change the price or quantity on a line where the charge account is disabled in the distribution screen. The system gives an error indicating the account is disabled.

For now we have to enable the code and disable it back once the changes to the PO line have been done. We are on R12.

Thanks