QM ACTIVE field mandatory in material master

Hi all,

Material Type - plant wise, i need to make it as Inspection type - Active indicator as mandatory. the field selection group 100 is working, but how can i make this mandatory condition as plant - material type wise? Pl. can any one explain steps? another pblm is all the fields under 100 field selection group also mandatory. but i want to make MARC-INSMK,MARC-QMATV these two fields only mandatory?.How can acheive?

fields in the field selection group 100:

MARC-INSMK Post to Inspection Stock

MARC-KZDKZ Documentation required indicator

MARC-PRFRQ Interval until next recurring inspection

MARC-QMATV Inspection Setup Exists for Material/Plant

Thanks., Meena