Adding User Fields to Migo Screen

Hi,

I have a query from my client that they want to have Customer Number and some other fields in the tcode MIGO (i.e) Goods Recipt. I didnt find any accurate enhancement for do that. Is there any enhancement or screen-exit for MIGO to add fields to the screen with F4 help or do i have to do modification.

Next thing is that in Standard transaction if i have to disable F4 help on any field than whats the appropriate solution to do that.

Thanks,

Usman Malik