Goods receipt using pricing condition value rather than PO

Hi all, I have a requirement to take the latest value from the PIR rather than from the PO. Has anyone done this before? Am wondering whether the best way to do achieve this is via a BADI upon saving the GR or there is a smarter way? If using BADI, should it be a MM or Finance BADI (when posting account entries)? Appreciate your pointers on the above. Thanks! SF