My edit isn't showing up - the if statement should b:
if InStr({@Values}, ToText({pool_bearbeit.typ}, 0, "") + ",") = 0
This will take care of instances where you have numbers "inside" other numbers, such as if you have a value in {pool_bearbeit.typ} of 20. Since "20" is in part of 200 it's data would not be included in the "then" portion of the If statement. Having the comma on the end of the field value when you're searching prevents this.
-Dell