HOW TO STOP LOT GENERATION DURING GR

Dear friends,

earlier lot generation was active for some materials for some plants, but now

my users don't need to generate lot during GR, so i suggested to deactivate thru quality info records by quality inspection control as "no active",

this time i found lots are generated during GR

but in material master , quality is active, but i don't need to change material master in this case.

so please tell me how tO STOP THIS LOT GENERATION

THANKS

BYE

KUMAR