For TStats, the binding can receive either Up/Down commands, or a raw temperature Command (as a number)
These are transformed, using a (static) MAP file, prior to being sent to Vera/MiOS.
For Up/Down commands, there’s an entry directly in the MAP file, so a single transformation is performed.
For raw temperature commands, the ‘value’ is looked up in the MAP file, which fails, and a subsequent lookup is made for a transformation entry _default which will match.
The warning comes from the miss on the first lookup. It can safely be ignored.