You can use annotations to justify guideline violations. Select a finding and press 'Add Annotation' in the context menu. Write a comment and optionally change the result type of the finding.
How do I justify guideline violations?
Save your annotations on the second page of the wizard in an annotation definition (file) next to the artifact or in a library. The annotation will be mapped for each run. The annotation details and the original result type are shown in the Finding Details view. Annotations are also included in all report export formats.