P4311 - Add fields from F4311 into Purchase Order Detail Grid Line

I have user request to add missing fields from F4311 into Purchase Order Lines Detail Grid Line.

I also found out just adding the fields into grid line will not work and also these new business required fields are not available pass in/out from Purchase Order master Business Function

I entered these problem before at earlier release like Xe and 8.0.  It looks we still have the same issue

Please let me know if Tools Development has suggestion to add these without major change(s) in Purchase Order related BSFNs

Thanks to share your expertise