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The Entrance control only works for the main MU, the base part, as I think you already discovered. Technically, the assembled parts enter the main MU, not the assembly station (if you choose attach MUs).
What kind of information would you like to capture?
you could insert a FlowControl with exit strategy assignment.
In the assigment method you then can place your code.
To me it seems you want to know which parts exactly cause the waiting time of the assembly station.
For now I think the simplest way is to implement an observer on your assembly station and watch the attribute ResWorking. ResWorking=true means that all the parts have arrived and are being assembled. You can use the observer method to record the EntryTime attribute of the parts inside the main MU.
Basically, you would loop through the contentslist of the main MU and copy that data to some table attached to the main MU.
No, it is really a smart feature. Your method will only be executed when the attribute in question changes.
Entry time should work for every MU, but not for other objects.