The <viewpoint name>* Conjugated Interface (~Interface) is a specialization of Interface that has the same features as its original Interface except that its Flow Properties are reversed (conjugated). 

To create a Conjugated <viewpoint name>* Interface

• Right-click one or more interfaces and select Tools > Create Conjugated <viewpoint name>* Interface.
  The Conjugated <viewpoint name>* Interface is created with the same Flow Properties as the original but with opposite directions. 

As shown in the figure below, the out/in Resource Interface is conjugated to ~in/out which has the same test results and date Flow Properties but in opposite directions. 

* <viewpoint name> - Operational, Resource, Service, Resource Service