The 1:n mapping is used to minimize conflicts the next time a model transformation is performed with the same target model.
Technical objects that are only used in the BPMN diagram can be marked as not to be considered. If you perform a transformation again, these objects remain in the BPMN diagram, even though they do not have an equivalent in the EPC and do not cause any conflict due to their marking.
Technical objects in the BPMN diagram can be marked as refinements or replacements of items in the EPC. If you transform the model again, no conflicts are displayed.