how to acces Matlab workspace from a transition in stateflow?

I have some transitions in Stateflow

On the transition I entered the code:

SR = RadioRequestMode(ml.semaphoreHelperFunc('get_Semaphore_request'));

There is something wrong with this.... When I try to run the model , Stateflow doesn't know that ml is a keyword ...

The same thing works just fine in built in model sf_cdplayer.slx

How can I fix this 'ml.' issue

Best regards