How to Allow GR of Only Co products no GR of FG material ?

Hi ,

I want to allow GR of co products and restrict the GR of FG materials how can I achieve this .

Can any one please let me know . I am dismantling a FG material and getting three FG materials into inventory, so I have created a BOM with recursive item and maintained CO products. I want GR of only CO products from the production order , please let me know how can I achieve this.

Regards,
Mahesh.