Attribute Names Checking
Setting the Configurator > Miscellaneous > Check Attribute Names parameter to true halts the processing (throw an exception) if an attribute in the rulebase is not present in the repository.
If this parameter is set to false, an error is logged in error.log and a null value is returned for that attribute and normal processing continues.
This parameter is provided mainly for backward compatibility with previous versions. In past versions, attributes not found in the repository were ignored. Now, more stringent checking is present, which can cut down on "typo" type errors, but it also means a rulebase that references a deleted attribute will no longer work.
The recommended approach is to set this flag to true in the system where you need to use the rulebase so that the system will alert you immediately if a rulebase contains an invalid attribute reference.