Hi Jan,
Interesting.... 
This is a ERP system but this is asking for the Netweaver export DVD in the screenshot. So no matter what DVD you provide it would never meet the criteria.
If you provide then Netweaver export DVD tag NW750_MID will match but product ERP will not and
if you provide the ERP export DVD then DVD tag will not match. So lets talk about from where SUM determine these tags. This details is picked from the stack.xml file. So this would mean that stack.xml is not correct. I would be interedted to know what exatly is being done. This is ERP system but you are trying to go to NW750 which cannot be done. You need to go to next EHP i.e. EHP8 if you need NW750 . EHP8 is not yet released .
If your project is something different , please let me know so I could suggest further. Better if you could also provide a doc with stack.xml generation steps and how your system is maintained in solman along with a bit about what you are trying to perform. You can remove the confidential details like hostname and all before providing it here.
Best Regards,
Gaurav