Conditional Mandaotry field in Material Master (Suggestion Needed)

Hi ,

I am having a requirement where i need to make a particular field to be mandatory for a certain condition in Material Master.

Say for a Product Hierarchy i want to make Volume Rebate Group mandatory ( Sales Org 2 View).

Please suggest the possible solutions for the same.

No userexit is possible , Screen exit is also out of picture as i will not get the value of second variable -

Thanks

Rajiv