You delete an operation like any other model element in IBM® Rational® Rhapsody®.
However, if you delete an operation that is realized by a message
in a sequence diagram, the message becomes unspecified (in both design
and analysis modes).
About this task
If you delete an operation, class, or event,
the corresponding message lines are not deleted automatically from
the diagram. To have the product perform this cleanup automatically,
set the SequenceDiagram::General::CleanupRealized property
to Checked.