Default valuation type in sale order

Hi,

We have some materials which are split valuated. We need to have default valuation type which will appear in the sale order when we create sale order for that material.

At present it looks that SAP does not have any provision to provide the valuation type defaults for sale order.

Does anybody know if we can set up default valuation types for sale order and how to do this?

Thank you for all your help.

Thanks,

-Shekhar