With the current manual dimensions a Datum Plane is visually ex-centred from it's origin, so when drawing a circle the circle is outside of the Plane representation. With this proposed change the visual representation is centred.
According to the standard, entities of type IfcSpatialStructureElement
should not be related to other spatial structure elements through
IfcRelContainedInSpatialStructure but through IfcRelAggregates.