Allocating internal equipment costs to a project

[Benjam]

Our company (a design consultancy) charges internal equipment to client projects at a weekly rate. I can't work out how to add this to a Project in SAP Business ByDesign and have tried several attempts.  We only use Project Based Services as each project is R&D

We can create a "Material", but you can't allocate the cost to the project without creating a purchase order for the item, but it's not being externally purchased so that doesn't work. You can't raise an "internal" PO so the cost never gets recognized to be allocated to an invoice. I considered raising a purchase from stock, but this requires all of logistics to be scoped in and someone to maintain fake stock levels which doesn't seam right.