In sequence diagrams, you can move all message types
on lifelines. However, when you move a synchronous message with
a return message, you must move the send message and the return
message separately and in a particular order; otherwise, only one
part of the message moves on the lifeline.
To move a synchronous message:
- Open a sequence diagram that contains multiple
lifelines with at least one synchronous message.
- In the interaction frame, click a synchronous message.
- Complete one of the following steps:
- To move the message up the lifeline, first drag
the send message to the new target location and then drag the return
message.
- To move the message down the lifeline, first drag the return
message to the new location and then drag the send message.