yes you can maintian tolerances & limits during GR/IR, you do customizataion in purchasing value keys here you can specify required tolerances by %age wise & assign this purchasing value key in the Material Master Record in purchasing view.
SPRO->MM->purchasing->materail master->define purchasing value keys.....
i hope this in standard that if u issue against reservation, and if u manually increase the quantity in MIGO screen, system will issue a error message.
if this is not the case with u please try making the Message no. M7 362 as error in OMCQ Transaction.
Message was edited by: Don ..!!