Removing UML model-to-diagram synchronization

In sequence diagrams, partitions in activity diagrams, and regions in state machine diagrams, any changes that you make to the UML model are reflected in their corresponding diagrams by default. Conversely, any changes that you make to the diagrams are reflected in the model. You can set the canonical property to false so that changes to the model are not synchronized with the diagram.

Before you begin

You must have an activity diagram, a sequence diagram, or a state machine diagram open in the Modeling perspective.


  1. Complete one of the following steps:
    • In an activity diagram, click in a partition.
    • In a sequence diagram, click in the contents area, below the header.
    • In a state machine diagram, click a region.
  2. In the Properties view, click the Advanced tab.
  3. On the Advanced page, expand the View heading.
  4. Under Styles, for the Canonical property, in the Value column, select false.