Problems in inbound delivery - LIPS - NOWAB

There is a problem with inbound delivery field NOWAB ''NO GOODS MOVEMENT'' This field is filled and because this isnt possible to make the goods receipt. I have two questions about this. 1- Where is comming this marked field? (Purchase order, Material Master) 2- I can take unmark this field? Would he have some solution to carry through the Goods Receipt.?

Thanks,

Gustavo Nogueira