The Check Rules facility checks for:
Bad property values (wrong type of value)
References to nonexistent data properties
Conditions that do not currently apply
to any object in the data, indicating rules that may be useless (however,
such rules may be useful with a different data set and so do not always
constitute an error)
To check your rules, choose Edit>Check
Rules or click the Check Rules button in the Messages
panel.
The result of the check appears as a series of messages
in the Messages panel, see
Messages for troubleshooting.
Note that messages of all levels are displayed, regardless of the
filter level set in the Messages panel.