The relation attribute @QUALITYTYPE is used to define whether the relation is based on physics or empiricism .
Place @QUALITYTYPE in the data slot of the relation
The only purpose of this attribute is that the Modeler does not accept two Empirical relations with the same left term parameter within a single solution object. This would lead to meaningless results.
Member of functional group: Modeling
Member of knowledge base type: Classic and general type, Scenario type and Taxonomy type