Reordering messages in sequence diagrams

In sequence diagrams, you can move a message across other messages and interaction fragments on the same lifeline or on another lifeline to reorder the sequence the messages occur. After you reorder a message, the message number automatically indicates the updated position on the lifeline.
You must have a sequence diagram open that contains at least two lifelines with messages.
  1. To move a message on the same lifeline, right-click a message; then click Select Message Set.
  2. Drag the message up or down to move the message to the new location. The grid guideline indicates where the message will be located in the diagram.
Note: To reconnect a message to a different lifeline, click a message handle and drag it to another lifeline. The message is reconnected to the new 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.

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