At the top of the Creo ModelCHECK Report window (attached screenshot), Error is indicated by a red symbol. Users are not allowed/not able to check-in the object. But further down, it says Parameter Error (for instance), with the warning symbol. Not so intuitive.
Not all Errors and Warnings are expanded in the ModelCHECK report window. In this example, the Errors aren’t that visible to the users as it should if the tab was expanded.