Screen Variant for IW81

HI Experts,

We have 2 Order Types for refurbishment, I need to make Valuation type mandatory in one of the order type .

I tried to create a screen variant which will make the fields mandatory , but this variant applies to both the order type.

Is there a way where I can specify that mandatory fields will be applicable only for the specified order type.

Thanks in Advance.

Hemant