Valuation type as mandatory in creating PR

Hi All,

Can you help me regarding this below Issue.

Client want to make Valuation Type field as MANDATORY, without entering this field PR should not get processed.

In case of Service PR, this field is not enabled. This is ok.

However in case of Material PR, Valuation Type field is enabled by default. We want this field whenever enabled as Mandatory.

Thanks in Advance

GANESH