Hello,

I' using version 1.9.0 beta 2.

I'm implementing the example Thermodynamics - an air filled control volume with subsystems (paragraph 15.2) from the book of Peter Fritzson. Things work-out oke.

But from paragraph '15.2.5.6 System and Valve Model with interfaces and Externally controlled flow' I get warnings and errors that I cannot solve. The model that started giving trouble is 'CtrlFlowSystem'.  I assume that 'ControlledFlowModel' should be 'ControlledValveFlow' but I get singular system errors and warning on unbalanced connector.

Did any of you implemented this example and did you have the same trouble? How did you solve it?