question

In this specific case it might be enough to set the utilize task on OP40 to "preempt only" and assign a priority > 0, so that the task is done first, even though the task to use OP20 was created first. The operator could however still "skip" OP20 if OP30 gets a new item first, due to the sources inter-arrival time distribution.

A more general solution would be to push the tasks onto a list instead of directly dispatching them. By sorting them into partitions based on the processor that created the task sequence, the operator can then pull the tasks from the list in the correct in a process flow. Since the task sequence wasn't dispatched to the operator directly, you have to "free" the operator from the utilize task manually after the process finishes (Wait for process finish -> Free operator activities).

operator-return-port-condition-fm.fsm

Note: I don't what your intention was for the center-connection between OP40 and S1, but

- Center-connections are mostly just a way to have a direct reference from one object to another. While they are the default way of referencing task executers for the "Use Operator" and "Use Transport" option, they don't possess any inherent logic.

- Nothing flows through centerport-connection and as such they can't be "closed" or "opened".