Hello Maria,
As I touched upon in the beginning of my reply about this tcode, I am unable to find this field (Req.Qty) in my system. I am surprised you have it, I checked again now, but I could not find it. Obviously, if someone is having this field in OICMPD then there is no issue at all. He/She can have it mandatory from spro setting itself as we do in other cases (Notification, Order etc).
As I mentioned in previous reply, it was with an assumption that like methe author too does not have this field in OICMPD, whereas yours is just the otherway round. Let's hope Mika have this field in his OICMPD..
My system is ECC EHP0.
Regards
KJogeswaraRao