Sage 100

Dear 90 bright minds, anyone has recently changed the calculated Average Cost in MAS90 (I am working with 4.4)? I am referring to the calculated Average Cost field in Item maintenance. The valuation method is Average. Client has items with negative average cost and they would like to correct those values. Any suggestions on the steps to take would be really appreciated. Thank you!

Use IM transaction entry to adjust the quantity to 0, update. Next, use transaction entry to add the quantities at the correct unit cost.