bSI 545 IfcTendonConduit PredefinedType optional

[aothms]

bSI-545 IfcTendonConduit.PredefinedType optional

[aothms]

--- tmp/a/IFC.exp	2023-06-19 20:49:01.863552300 +0200
+++ tmp/b/IFC.exp	2023-06-21 13:28:55.225174900 +0200
@@ -11521,23 +11521,24 @@
 ENTITY IfcTendonAnchorType
  SUBTYPE OF (IfcReinforcingElementType);
 	PredefinedType : IfcTendonAnchorTypeEnum;
  WHERE
 	CorrectPredefinedType : (PredefinedType <> IfcTendonAnchorTypeEnum.USERDEFINED) OR
  ((PredefinedType = IfcTendonAnchorTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcElementType.ElementType));
 END_ENTITY;
 
 ENTITY IfcTendonConduit
  SUBTYPE OF (IfcReinforcingElement);
-	PredefinedType : IfcTendonConduitTypeEnum;
+	PredefinedType : OPTIONAL IfcTendonConduitTypeEnum;
  WHERE
-	CorrectPredefinedType : (PredefinedType <> IfcTendonConduitTypeEnum.USERDEFINED) OR
+	CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
+ (PredefinedType <> IfcTendonConduitTypeEnum.USERDEFINED) OR
  ((PredefinedType = IfcTendonConduitTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
 	CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
   ('IFC4X3_DEV.IFCTENDONCONDUITTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
 END_ENTITY;
 
 ENTITY IfcTendonConduitType
  SUBTYPE OF (IfcReinforcingElementType);
 	PredefinedType : IfcTendonConduitTypeEnum;
  WHERE
 	CorrectPredefinedType : (PredefinedType <> IfcTendonConduitTypeEnum.USERDEFINED) OR