As you create a topic you can check that content is validating. The Rules tab displays a validation message for each paragraph in the topic that has validated against the rule properties. As an indication that there is a problem with the content, the messages stop at the first paragraph that fails validation. For example, if the tenth message in the Rules tab shows an invalid status you should check the tenth paragraph in the topic and make the required corrections.
Validation is shown when you have the rules tab displayed and save the topic, or choose Validate on the Editor's Review tab.