How to Change Valuation Class in Materail master

if you want change the valuation, then you have to change the change the valuation class, and this is not possible if you have stock.

what else would you do than moving the stock from old material to new material?

if it is equally set up, then you can use MIGO with 309 movement, otherwise issue to stock of old material to cost center (201 movement) and cancel the goods issue to cost center (202 movement) using the new material number. of course the prices have to equal in both materials, otherwise you leave a difference on the cost center

Believe me, this answers can be found in those existing discussions.

Preconditions for changing valuation class:

(1)No stocks in current AND previous period !
   Be sure that no stocks in actual AND previous period exist. Refer to note 30656, with an example how to get zero stocks.

(2)No purchase orders without deletion flag !
   See SE16 ->table EKPO. Select all po items of the related material. If you found items with LOEKZ <> ‘L‘ you have to delete them in ME22.

(3)No production orders !
   See SE16 ->table AFPO. Select all items of related material/plant.    If you find at least one item, change of val.clss. is not possible.You have to archive! these production order(s) !

These hard restrictions are necessary as inconsistencies in account assignment will follow after change of val. class, when proceeding follow up functions of a purchase order or a production order after you changed the valuation class. Under special circumstances I is not possible to fulfill these hard restrictions. Therefore the please refer to note 160970 as a possible solution, but read carefully the explanations under section ‘solution‘.