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Pset/Qto change log


I’m looking for a documentation that trace all changes regarding Pset/Qto from a schema to another.
For instance in IFC 2x3 the property “SubType” of the Pset “Pset_DuctFittingTypeCommon” no longer exist in IFC 4.
Another example with the property “Weight” of the Pset “Pset_AirTerminalTypeCommon” in IFC 2x3. It may became “GrossWeight” in IFC 4, but it is only a thought as this modification is not logged.

Is there any document that store such changes ?

Thank you in advance.