Thanks for replies;
My test is like this:
1. create new material with price control V and the price 10 $
2. take 10 Pieces of this material with 501 movement type (goods receipt)
3. change the price and new price is 15 $ (MR21)
4. take 10 Pieces of this material with 501 movement type to the same storage (goods receipt). Now i have 20 pieces of this material
5. sent 1 Piece with 201 movement type (goods issue)
6. i want to see average material price should be 12,5 $ but average material price is 15 $ when i looked at MM03
I think now i explain the issue clearly.