ReferencedByPlacements

[aothms]

Add inverse

[aothms]

--- tmp/a/IFC.exp	2022-02-06 16:39:15.217030600 +0100
+++ tmp/b/IFC.exp	2022-03-22 21:19:59.180930300 +0100
@@ -8285,20 +8285,21 @@
 END_ENTITY;
 
 ENTITY IfcObjectPlacement
  ABSTRACT SUPERTYPE OF (ONEOF
 	(IfcGridPlacement
 	,IfcLinearPlacement
 	,IfcLocalPlacement));
 	PlacementRelTo : OPTIONAL IfcObjectPlacement;
  INVERSE
 	PlacesObject : SET [0:?] OF IfcProduct FOR ObjectPlacement;
+	ReferencedByPlacements : SET [0:?] OF IfcObjectPlacement FOR PlacementRelTo;
 END_ENTITY;
 
 ENTITY IfcObjective
  SUBTYPE OF (IfcConstraint);
 	BenchmarkValues : OPTIONAL LIST [1:?] OF IfcConstraint;
 	LogicalAggregator : OPTIONAL IfcLogicalOperatorEnum;
 	ObjectiveQualifier : IfcObjectiveEnum;
 	UserDefinedQualifier : OPTIONAL IfcLabel;
  WHERE
 	WR21 : (ObjectiveQualifier <> IfcObjectiveEnum.USERDEFINED) OR