Extended dependencies are links between ILM objects. These links help to make object relationships clearer but are not interpreted and checked by PowerDesigner as they are meant to be used for documentation purposes only.
You can complement these links by applying stereotypes. Stereotypes are used to define the semantics of extended dependencies between objects in the ILM.
You can type stereotypes directly in the Stereotype column of the object property sheet or select a value from the list if you have previously defined stereotypes in an embedded or imported extended model definition (.XEM).
For more information on extended dependencies, see "Using extended dependencies", in the Objects chapter of the Core Features Guide.