Scanning within DTPO

I installed my new Scan Snap (S1500M) and I have been able to scan quite a few documents into DevonThink Pro Office. Works great and I guess I could live with this situation, because the Scan Snap is very fast- especially compared to my flat scanner that I use for photos. But for some reason I cannot scan within DevonThink Pro Office.

Don’t know what I am doing wrong, any suggestions? I hope this is the right forum, my first post has to be this one, oh well.