UML Modeling Techniques > Object interaction modeling > Sequence diagram > Overview of sequence diagrams > Checking a sequence diagram
  
Checking a sequence diagram
Right-click the diagram, point to Report, and then click Consistency.
The report is generated to the Output pane.
Modeler makes the following checks:
Each Actor has at least one connection (a message to or from) on the diagram (C24002).
Each Part or Port:
exists on a Composite Structure Diagram (C20042).
has at least one connection (a message to or from) on the diagram (C24004).
Each Instance has at least one connection (a message to or from) on the diagram (C24004).
Each Interface Device has at least one connection (a message to or from) on the diagram (C24003).
Each message is not being called by an inactive Instance, that is, an Instance that is not called (C20034).
Each Operation message belongs to a Class. Note that a message can be invalidated by moving the Operation to a different Class (C20005).
Each Package has at least one connection (a message from or to) on the diagram (C24057)
Each Start Selection, Start Iteration, Start Parallel and Also Parallel step has at least one sub statement (C20000).
Each Subsystem has at least one connection (a message from or to) on the diagram (C24013).