valuation Type

Hello Guru

IT is urgent

I have one material that has be maitened in one plant with four valuation types

A.B C,&D the materail has stock 6no within A val type

val type B, C &D had no stock(same materail &plant above said)

once again i go for procurement of this materail with the same plant, i did PO

and when i go for GR, at that time i wanted to enter val type B the system will not take this val type , system will defaultly it will take A val type only ... plz suggest me how to do or enter val type B

regards

sapman