R12.1.3 How do you issue materials from an OPM inventory organziation to project Accounting?

We are using Project Accounting and we have recently implemented a Process Manufacturing (OPM) Enabled inventory organziation. We need the abiality to issue materials from inventory to the Projects so that the costs are captured in Project accounting. In non-OPM organziations, we are able to turn on the "Project Cost Collection Enabled" attribute in the inventory organzaition parameters. This opens up the project and project task fields in several material transaction forms. However, in the OPM organziation, this option is grayed out. We have had an SR with Support and they say OPM and Project Accounting are not supported. Seems