API Reference > presentation-common > PresentationRules > DEPRECATED_RelatedPropertiesSpecification > relatedClasses relatedClasses relatedClasses: MultiSchemaClassesSpecification | MultiSchemaClassesSpecification[] Specifications of related ECClasses. Optional if DEPRECATED_RelatedPropertiesSpecification.relationships is specified. Defined in presentation/common/src/presentation-common/rules/content/modifiers/RelatedPropertiesSpecification.ts Line 73 Last Updated: 29 November, 2022