Charles Hoffman has just published a really excellent set of documents that succinctly describes the Fundamental Accounting Concepts.
Please read the Overview, as well as the detailed examples that show detailed analysis of each type of rule.
Make sure that you use the Beta site to run these rules on your filing (click on the beta link at the top of the page after you log in). This documentation makes it extremely clear how to interpret the results of validating using the Beta CleanScore release.
Let us know if you have any questions!Please pass this along to everyone else in your organization!