Validating your Product Designer changes
Product Designer validates changes as you move from one page to another. It indicates whether
there are validation errors by displaying a red X 
on the Changes icon in the toolbar.
Additionally, when you are viewing any page that enables you to make changes to the product model
or system tables, you can click Validate to manually validate your
changes. Validation errors appear at the top of the page on a
red background. The errors are marked with a red X and appear on a red background. When no validation
errors exist, clicking Validate displays the message
No
validation errors marked with a green
checkmark 
on a green background.
Finally, when you select Commit, Product Designer performs validation of all changes in your active change list and proceeds only if it does not detect any validation errors. Your commit operation is blocked until you resolve all errors in the change list.