PO FBDI - Error messages on CHARGE_ACCOUNT_ID and VARIANCE_ACCOUNT_ID for line add to existing PO

I'm attempting to add lines to an existing PO in our TEST environment. I'm receiving errors on the Distribution tab as shown in the screenshot below.

I've checked that the charge account is valid, building it directly in Preferences for the listed Req BU. The Ship-to matches the existing PO header and lines.

The Mapping set for WSH Charge Account rule screenshots are below.

I can add the line manually on the PO with no errors.

I'm not sure where else to look to find the reason for the FBDI errors on this.