How to resolve Check Entity Error/warning on imported STEP file?

With SW2016, I opened a STEP file assembly from an enclosure manufacturer, and one of the included parts has a couple of Check Entity warnings.  The part has no features, it was just imported as a single entity.  https://www.okwenclosures.com/en/media/sec/static/models-3d/00016107.step?psku=B6505229 (You need to register with them to download.)  [ When imported into a very old version of Autodesk Inventor, I do not get this warning. ]

1. How do I see exactly what Solidworks is complaining about?

2.  Assuming the imported part is OK as-is, how do I clear the warning and move on?

Thanks!

- Joe