I have also coded along the lines that Eric has, and reply with QM as the PID in the NACK.
We might all think it is logical, but it is not defined behaviour as per the E1.20 document, which states the response to a QM shall be a STATUS_MESSAGE response.
10.3.1 "A responder with no messages queued shall respond to a QUEUED_MESSAGE message with a STATUS_MESSAGES response. "
Where do we state that this does not apply to a NACK from a responder with no messages queued ?
Are we happy to allow either PID in NACK responses, and add this behaviour to an E1.20 erratta ?
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