When you check a diagram with Model Expert, you will see a new copy of the original diagram, colored using the color settings of the reference model. For example:
The simplest way to fix these errors is just to select the problem items – either from the copy or original diagram – and fix them. Because the diagram (above) has all the same elements as the original, you’ll be fixing the original elements.
The notes on the diagram tell you what the errors are, so it’s easy to work your way through them using standard EA functions