Consolidate Project / Unique Procurement Project & Non-project purchase of same component

Just looking for any “left of centre” ideas or suggestions, please…

We have demand for the same purchased part (same site) from 

• Projects
• Projects with purchase req authorisation
• Customer Orders
• Shop Orders
• Material reqs

We run PMRP and MRP which generates the necessary reqs but we’re unable to consolidate the supply onto a single Purchase Order.  You can mix Projects and non-project demand onto a single PO but once the req is a project one that needs purchase authorisation you can’t mix with any other POs…

Any ideas gratefully received..

Thanks