Hi Satish,
When you use material group, system can select all the products assigned with that material group. If you want to restrict further based on products, then will you enter the individual product numbers in the selection?
If so, then you are undoing the selection based on the Material group, right?
I think because of that, system is designed to allow you enter only one option between material group or material.
If you want to select based on material group separately and product number separately, then better go with 2 different filter types.
Could you please explain with specific examples why do you need both material group and material as selection?
Regards,
Manimaran M.