IV before GR

Hi all

I am in the process of creating a PO for a scenario where I will have to do IV before Goods Receipt. For this, I unchecked the option "GR-based IV" while PO creation. On doing this the system shows the error "Please enter GR-based IV". How to rectify this error? I have unchecked "GR-based IV" in the vendor master record also?

Regards

Madhu