Allocate a user to a Job Function
The method addJobFunctionToUser allocates the entered user to the entered Job Function in JobRouter.
In case the request is successful, it returns the boolean value true.
In case the requested user or Job Function does not exist, an error message will be returned. An error message will also be returned when trying to allocate a user to a synchronized Job Function or the user is already part of this Job Function.
Method reference
Return value: bool; true, if the Job Function was successfully assigned, otherwise false
