Question regarding cost simulation R30812

Hi,

I would like to know how and where  do we store the changed cost of Purchased items, and then we want to run the cost simulation based on the new costs of purchased items.

If we directly import changes in 07 cost of purchased items in F4105 then there will be integrity issue between F4111 and F0911 in the work orders.

I have checked that R30812 UBE does the cost simulation on the basis of 07 costs from F4105 cost ledger only, so we have to have new 07 costs of purchased items in F4105 in order to do the cost simulation. So how do we do that without causing the integrity issue between F4111 and F0911 for the existing work orders which are in process.