Local Pre/Post Conditions

Actions can be further defined with pre-condition and post-condition notes, which constrain an Action's entry and exit.

Example Activity diagram with local constraints in Sparx Systems Enterprise Architect

Attach a constraint to an Action

Step	Action
1	Right-click on the Action and select the 'New Child Element\| Attach Constraint' option. A Note is created on the diagram, connected to the Action.
2	Right-click on the Note and select the 'View Properties' option. The 'Constraint' dialog displays.
3	In the 'Constraint Type' field, click on the drop-down arrow and select the required constraint type.
4	In the 'Constraint' field, type the text for the constraint.
5	Click on the OK button to save the constraint.