Assigning operations to messages in sequence diagrams

In sequence diagrams, you can set a message signature by assigning an operation to it. When you create a message, the operation on the target interaction instance is created automatically and you are prompted to name the newly created operation.
You must have a sequence diagram open that contains at least two lifelines with messages. The property of the target lifeline to which you add the operation must be a class, interface, or data type.
To assign an operation to a message:
  1. In the navigation view, click and drag a class, interface, or data type to a lifeline in the interaction frame. The interaction instance now represents that source element.
  2. In the navigation view, click and drag an operation to a message in the interaction frame. The operation must belong to the source element that is assigned to the target instance.
Related concepts
Messages in UML diagrams

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