(available since version 2.6)
Every line in the Code Generation Progress dialogs, Messages list has a link back to the model element which is responsible for the shown message, warning or error.
To access/find the model element and help you clear any modelling issues you can open the context menu in the Messages list and select the Show relevant element in model.
This will select the element in the Project Browser of Enterprise Architect and also will try to open the Diagram containing the Element.
The same can be done even after the Code Generation Progress dialog is closed simply by opening the System Output: LieberLieber Embedded Engineer tab and double clicking the corresponding line.