Sorry, I haven’t worked on these for ages.
I have the engineering software, but V2. Last revision was V5 I think.
I can remember finding the part to change in the XML file, but can’t find my notes any longer.
I recall it used to take several attempts to remove the message via dialling out, but there is a high change BT have killed that service though.
If you uploaded your backup XML, I would of thought that would have cleared the commission message, unless it is tied to the CPU hardware number. If that’s the case, I would be searching the XML file for the hardware number