The KNX Interworking standards do not allow that additional source - or destination address information is transferred in the Application Layer payload. That would moreover not be OSI-compliant.
ETS4 foresees solutions for this case. Simply create the first room, with the first linked devices and Group Addresses, and copy the room 999 times (or copy it 9 times, then copy the result 10 times and again 10 times) and set the Group Address shifting option.
The good news is that around 7 500 other devices will be able to communicate with your appliance.
For closer explanations: KNX Association Brussels, eCampus, training and KNX Specifications.
Mr. Steven De Bruyne
System Department - KNX Association
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