Hi Sap gurus ,
I have a material that has a Valuation class X I need to change it to Y but when i try to change it in MM02, the Valuation class is automatically changing back to X and it gives me a message to check the error log .
The error log gives me an error saying that
Production order already exists
and shows me a list of the production orders that already exist.
Can anyone please explain the reason for the error and how i can change the valuation class in the MM02????