Hi,
Try this:
if {@QtyScrapToNumber} = 0 then 0 else
{@QtyScrapToNumber} % ToNumber({MIMOMD.MIMOH.endQty_form})
or
(PercentOfSum ({@QtyScrapToNumber}, ToNumber({MIMOMD.MIMOH.endQty_form})))
We both missed this parenthesis to @QtyScrapToNumber i.e { }
Thanks,
DJ