Grant Billing After Credit but no Rebill

I have a user who created a grant bill (starting in customer contracts), then created a credit bill, but did not do a rebill. The lines from that bill still need to be billed as the original and credit bills are both reflected and offset each other in the contract and in AR. However, there are no longer any BIL lines in Proj Resource to get picked up on a new bill. The original lines, as expected, now show as BLD with the credit lines as BAJ.

Any suggestions on how to proceed? Thanks in advance.