Default Budget Date on an Invoice Matched to a PO

Summary

What is the default budget date on an invoice matched to a PO?

Content

We have BCEA turned on in our system.  The budget date on an invoice matched to a PO is defaulting to the invoice date which is our configuration.  This can result in a budget checking error if the PO was budget checked before the end of the budget period but the invoice is dated after the end of the budget period.  If the budgetary funds were reserved and the purchase was made prior to the end of the budget period, shouldn't the budget date of the invoice be the same as the PO?  I thought at one point over a