During download to a b3 controller you may see the error:
Module: BACnet plugin
Module code : 0
Technical info: BatchedWritePropertyError
EcoStruxure Building Operation
Automation Server WorkStation
Binding sending data to a point during the download process
This error is benign and can be ignored.
Also check out the SmartStruxure - b3 Engineering Process - Part 6 Downloading Quick-Help video on the Exchange.
The "BatchedWritePropertyError" may also be seen with "Property value out of range" rather than "Unknown Object", in this case check the properties/settings of the BACnet Object, the channel may be out of range or an Expansion Module may be required