Update Unit Cost on Production Order

Hi, I have 3.70b version. I noticed that the “Update Unit Cost” function on a Productio Order dpesn’t work when called from “Change Status” report. I followed the process in debug - the cost was appropriately calculated, but somewhere in the process it failed to be recorded. Anybody did experience the same problem? Is it a known issue with any hope to be solved in version 4.xx? Anna