An Event Instance on a Concurrency Diagram, Communication Diagram or System Architecture Diagram is iterative.
An Operation Instance on a Concurrency Diagram or Communication Diagram is iterative.
By default, the Iterative check box is cleared.
On a diagram, the Iterative property is indicated through an asterisk.
This property is set on the Options tab of the instance Property Pages for an Event Instance (message) or Operation Instance (message). To view an instance's Property Pages, on the diagram, right-click the item, and then click Instance Properties.
The following section provides information about the items and diagrams for which Iterative is a property. For more information about an item or diagram, click it.