Ipek
I would suggest you to take help of some resource in organization who can explain you a bit the flow of materials etc. With your screen shot it is evident that demand is in different locations which means in case of HNT_KUNDE1 & 2 you will have two supplies of 120 each. Then it would come to HNT_PROD where this netting has to happen for considering the supplies. There are various master data & parameters for the same example t-lane is available or not between the locations, what's its validity etc.
Plus I don't see any supply on KUNDE1 & 2 which means you have not even taken a CTM run. I would suggest you to get in touch with some resource IT or functional person who can guide you more. On this platform of course you can clear your doubts but at least first see results yourself after understanding what is happening in business and system.
I hope you will come back with more questions when once with more understanding from your colleagues.
Regards
Rahul