RobotStudio event

Create System from layout 4Robots and IRBP_R

I tried to create this system withe the robots and the interchange but only the robots are included to the controller. In the Task selection window during creation the positioner was shown and there was no error message or warning.
Is there a possibility to add the positoner to the system after creation? Or maybe any other option?

With 2 Robots it is working fine.