A user mistakenly created a product cost collector using the Production Plant / Plant Plan setting. This was discovered when we couldnt backflush the material as it couldnt find a cost estimate. We created a cost estimate and marked and released it however still got the error "Error determining cost estimate". We deleted the cost estimate, deleted the cost collector, and deleted all planned orders for the material. When we went back in to create a new cost collector it will not allow for the selection of production version. All entries are greyed out and it has preselected the production plant plannin plan setting again. How do we get this cleared up so that we can setup the PCC by production version?