Goods receive without any accounting document but should not increase moving average in material master

Dear User,

I have an issue, we create PO for 100 and done GRN for 100 but we still receive same material extra suppose be 2 qty and this also to be received but without any accounting documents. I know we can use 511 mvt. type and receive goods without any accounting document but its effecting moving average price which should not happen. Please help me out with solution.

Thanks,

Manoj