sap mm valuation class error

Hi,

When I'm creating Raw material in material master (MM01) by default finished product (7925 ) showing in valuation class.

error message its showing like: "Valuation class 7925 not allowed for material type Raw material".

in "OMSK" setting also configuration is correct.

I'm checked by deleting 7985 and 7920 in valuation class tap but when creating material (MMO1) again its showing 7985 and 7920 by default.

please guide me what to do.

Regards

sampath