change PO receipt form

SOLVED

How can I add the accounting period to the "System.PO_Receipt"  form?  All of the fields appear to be custom (ie:  po*vndnme)  but they are not listed in calculated fields or in global calculated fields.  We need to add the accounting period the PO receipts are hitting when they get posted because they are not always matching the system date and there isn't a way to set up a warning for this discrepancy either.