I have seen a number of responders that support GET for DEVICE_LABEL on Sub-Devices, but that don't allow you to SET it.
For example, the Root has a Label that can be both GET and SET, but each sub-device has a Label like "Channel 1" that can only bet read with GET. When you try to SET the Sub-Devices's label it will "NACK Unsupported Command Class"
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