What constraints also apply to sequence and message flows?
In BPMN, the following constraints apply to sequence and message flows:
A sequence flow may not extend beyond process or pool boundaries.
A message flow may not extend beyond a process boundary and may not be used within the same process or pool.
When a boundary object is selected, then only one of the four Smart modeling buttons is visible
The BPMN diagram of an item from ARIS modeling can be determined as follows:
In the BPMN diagram, each object of the Pool type represents a process.
Items that have a connection of the belongs to type to another item belong to the same process as the item that is the target of this connection.
If objects are moved to another object of the Pool type in the BPMN diagram, other constraints may also take effect. In this case, the user can decide whether he or she wants to cancel the move or delete the invalid connections.