I think that my question is super easy but I can't understand why my exit strategy is not working.
If you look the picture Cattura1 you can see the easy example I am working with.
What I want to obtain is a control of the red line that allow the entities move in the next line (blue) only if in the yellow line there are not packages.
What I did is an exit strategy (Cattura) on the red line based on the MUAttribute "NumMU) of the yellow line. If there are some packages in the yellow line (Line2) i want to stop my packages in the red line (Line)