Since MeasureDimension has been removed there should be a complete cleanup of remaining related constructs, e.g.:
"SingleMeasureDimension" constraint in "DimensionList"
Many references to "MeasureDimension" in numerous XML documentations
In schemas/SDMXCommon.xsd and in schemas/SDMXCommonReferences.xsd remove "MeasureDimension" from: "DimensionTypeType", "ObjectTypeCodelistType", "ComponentTypeCodelistType", "DataStructureComponentTypeCodelistType", "DimensionTypeCodelistType", "ObjectTypeListType".
Also remove "MeasureDimensionReferenceType", "MeasureDimensionRefType", "MeasureDimension" (empty type).
Since MeasureDimension has been removed there should be a complete cleanup of remaining related constructs, e.g.:
Also remove "MeasureDimensionReferenceType", "MeasureDimensionRefType", "MeasureDimension" (empty type).