A single Group Object can be associated simultaneously with several Group Addresses in ETS, which is typically used so that an actuator reacts to several commands (e.g. individual command + zone command + scene).

Multi-binding is a fundamental KNX pattern. Concrete examples: a lighting circuit that reacts to its local switch, to an 'all off' corridor command and to a 'leave for work' scene; a roller shutter that reacts to its local button, to a zone master and to a safety scenario (automatic close on storm warning). The actuator has a single Switch Control Group Object bound to 3-4 different Group Addresses (Lighting_Local_LivingRoom, Lighting_All_Off, Scene_Departure). All these addresses can write into the Group Object; only one (the sending address) is used when emitting status.

Make a habit of putting the sending Group Address first in the binding list — the order in the Associations tab determines which address is used for status transmissions, and surprises here can take hours to diagnose.