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Note that the title of a document should be unique across all documents within the MarvelClient Configuration database.
The title of a document may contain any characters except for a carriage return (newline).
In edit mode around 80 characters fit into the title field - even though you can specify much longer titles it is recommended to keep them short and descriptive.
See Also
Configuration basics - general fields in the header area of Actions
Enabling / Disabling a document