Hello,
Does business function set "DIMP" is active?
Are you sing IS Mill Products function "Fast Entry of Characteristics in Goods Receipt"?
In OPK0 you need to active the screen Mill: Goods Receipt (8485) for confirmation profile for the single-screen entry. Please refer
Goods Receipt of Co-Products in Confirmation (SAP Library - SAP Mill Products)
Best Regards,
R.Brahmankar