2 Valuation Class - Same Material Type

Hi ,

I have 2 Valuation class 9001 & 9003 for ZPAC Materil Type .

9001 - Packaging & 9003 Casing .

Where i can find the difference between this Valuation class in Material Master.

I have 2 Material with different Valuation class with same Material type.

I Could nt able to find the difference in between this 2 material.

Like Packaging & Casing where i can find this,

Pl suggest.

Thanks

Ram