Validates the currently active project. If a project contains multiple pages, all the pages are validated. Validation results are reported in the Messages Pane in terms of the number of errors and warnings. If an error or warning is detected, a message about each is displayed.
If there is a validation error because of a missing page source on a page, then the Messages pane will offer a quick-fix to add the missing page source to that page. On clicking the quick-fix, a dialog appears that enables you to add the missing page source to not only the selected page but to all other pages where this quick-fix is applicable. This enables you to fix missing-page-source-errors faster.