Required a process to generate AP invoice based on PO, by summarizing all PO Receipts in single AP I

Required a process to generate AP invoice based on PO, by summarizing all PO Receipts in single AP Invoice..

We have subcontractor Jobs.

We release a Job batch quantity to OSP Subcontractor : 10,000 nos

He will send the completed assemblies whenever it completes like 1000, 500, 2000 with DCs individually

After completion of Full Batch quantity of 10000 nos then he will send the actual Invoice for payment.

Through DCs we are not allowed to make PO receipt because AP Invoice will get generated upon Receipt which does not having Invoice references.

Because of this WIP Move completion has to kept on hold until full batch quantity (10,000) delivered and invoice received.