Two custom states: different options?

I have created two custom states. The one called sessiefilter works fine. The new one, documentfilter, doesn’t give me the same options.
Look at the Only When field: for sessiefilter, I chose an “is not” statement, but cannot pick this one now for documentfilter.
Does anyone knows why?

I think I found out the answer. It has got to do with the field type.
Nummer is a text field, Bestand is a file type.