Due to various historical errors, an item has an incorrect unit cost. Given that the correct unit cost can be calculated manually, is there a safe way to ‘fix’ the unit cost in Navision (say, by positive and negative journals)?
It depends where the cost issue has happened. If the positive was wrong and the cost on the negative was manually altered you could revalue the positive.
Ultimately loading the reverse will sort it out, but you need to make sure everything is posted, or it will just move!