BOM and Item Charge in NA

Hi, I’ve produced a new item with help of bom item journal. A negative and positive adjmts were made by Navision. Everything seems to be ok. Cost of produced item=costs of components. Then I’ve posted an item charge invoice for components and adjusted cost item entries etc. Navision has modified only negative adjustments. So now cost of produced item<costs of components. Is there any way to solve this problem or should I revaluate positive adjmt in revaluate journal? Thanks for any help Soya