CER includes a comprehensive rule set validator which can detect errors in your rule set before allowing your rule set to be published or executed. The CER editor provides functionality to allow a user to validate a rule set from within the editor.
Validation messages will be displayed in a validations panel. This panel is displayed under the Diagram canvas the first time a rule set is validated.
For a detailed explanation of the CER validator and how it works, see Chapter 3 of the Cúram Express Rules Reference Manual.