In sequence diagrams, you can reorder lifelines or move a message
across other messages and interaction fragments on the same lifeline or on
another lifeline to reorder the sequence in which the messages occur. After
you reorder a message, the message number automatically indicates the updated
position on the lifeline.
Restriction: - You cannot directly reorder a skewed asynchronous message. For the message
renumbering to occur, you must move the other messages around it to change
the skewed order.
- You cannot change the order between a send message and a return message.
You must have a sequence diagram open that contains at least two
lifelines with messages.
To move a message or lifeline:
- Right-click a message or lifeline; then click Select
Message Set/Reorder.
- Drag the message or lifeline to move it to the new location. The grid guideline indicates where the message will be located in the
diagram.
Note: To connect a message to a different lifeline, click a message
handle and drag it to another lifeline.