The Access MusicBrainz statement requires various metadata items to be in place in order to run. Release Matching requires a consistent MusicBrainz Release Id and the following metadata to be present: MusicBrainz Recording Id and/or a MusicBrainz Release Track Id.
The Validate MusicBrainz Metadata statement allows you to test the state of the metadata. You can elect to test the release Ids and/or the track positioning metadata.
The action test state will be set to true if the metadata being tested is okay. ie. a consistent Release Ids and/or the track positioning metadata exists. If any of the tested metadata falls short, the action test state will be set to false.
The statement is not valid in grouped execution mode.