If a DITA transformation results in errors or warnings, the information is displayed in the message panel at the bottom of the editor. The information includes the severity, description of the problem, the name of the resource, and the path of the resource.
Validate and Check for Completeness action that
is available on the DITA Maps Manager toolbar and in the DITA
Maps menu.
Warning - The transformation encountered a problem that should be
corrected.
Error - The transformation encountered a more severe problem, and
the output is affected or cannot be generated.
See More icon to open a web page that contains
more details about DITA-OT error messages.