RMA billing block not stopping invoicing

Credit Memos issued for returned material authorization (RMA) that have a billing block of Check Credit Memo on at the header are getting invoiced when they should not be able to. There was a billing block on at the header but accounting was able to invoice it without getting an error message that it was blocked.

Also, there was a debit memo with a billing block on for Prices Incomplete at the header and it was invoiced without an error message that it had a block on it.