ok, after more debugging I found the solution by myself:
The problem was the sub dispatcher logic used within the workplace scenario.
To get the right subdispatcher I had to do the following:
Code:
String expressionBase = getWorkpage().getDispatcher().getExpressionBase().replace("}", ".");
The string contains now e.g. #{d.d_1. (for subdispatcher d_1), so I can concatenate this with the bean info => expressionBase + "ScheduleUI.xxx"
Markus