This property is read-only..

A cross-reference to the counterpart is displayed at the plug definition (i.e. the assigned plug definition representing the receptacle / coupling). For a combined representation of male and female pins in one function, no cross-reference is displayed. A cross-reference to the matching pin is displayed at the pins. If male and female pins have the same DT, only the position of the matching pin is displayed. For non-placed direct connections, the cross-reference shows the name and position of the connected counterpart.

Reference

Placement3DPropertyList Class
Placement3DPropertyList Members