Use of Project Locators for Destination Type - Inventory (Procurement)

We are running Oracle eBus R12.2.8 cMRO, WIP, BOM, INV, PJM, Project, PO, AP, EAM, IB, Cost Mgt etc.

We have been told (by Support and via metalink notes) that we can use Project Locators via Purchasing with Destination = Inventory and tag a Project and Task on a Req which will copy to a PO and then when that associated Invoice is approved/accounted it will flow to projects via PRC: Interface Supplier Costs. Then when that same material is used via material/ Inventory issues from cMRO-_>INV/WIP->Cost-PJM->Projects it will not come over again unless it crosses projects or hits a project with no procurement Project locator etc. so there is no double dipping etc..