IF ('PRODUCT_VIEW_DEFINITION_RELATIONSHIP_ARM.VIEW_DEFINITION_USAGE'
      IN TYPEOF(input\Item_shape.described_element))
      THEN
        RETURN(input\Item_shape.described_element\View_definition_relationship.related_view);
    END_IF;
    IF ('ASSEMBLY_STRUCTURE_ARM.PRODUCT_OCCURRENCE_DEFINITION_RELATIONSHIP' IN
        TYPEOF(input\Item_shape.described_element))
      THEN
        RETURN(input\Item_shape.described_element\Product_occurrence_definition_relationship.related_view);
    END_IF;    
    RETURN(?);