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AC-7 asks for the meterSlaveId parameter to be advanced. That property does not exist on nymea 1.15.2 param types: the metadata verifier rejects unknown fields, so adding it makes the whole plugin fail to load rather than merely hiding a parameter. Measured by loading the plugin JSON, with and without the flag, into a PluginMetadata linked against the installed libnymea, rather than read from an upstream tree that may differ from the package. Also records the three other divergences the multi unit ID work runs into, two of which predate it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>