UML14 — UML Semantics, OMG-UML V1.2 Use Cases July 1998, page 2-99

Summary: In the current version of UML, use cases must not have associations to other use cases specifying the same entity. Use cases can exchange messages only with actors and not with each-other. UML use cases are always initiated by a signal from the actor.

However, there are use cases that are initiated by a system if a specific condition is met. Example: in the well-known ATM machine example the use case "dispense cash" is initiated by the system, if the customer request was evaluated as valid. The use case "dispense cash" is not initiated by the (user) actor. In other words, the use case "dispense cash" receives a message or signal from the other use case specifying the same system. Therefore, the association between use cases must exist.

Solution: Allow associations between use cases specifying the same entity.

rejected