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Gets an object that can enumerate change units that are contained in this change.
HRESULT GetChangeUnits( IEnumSyncChangeUnits ** ppEnum);
[out] Returns a change unit enumerator. Returns NULL when this change does not contain change units.
S_OK
E_POINTER
E_OUTOFMEMORY
SYNC_E_ITEM_HAS_NO_CHANGE_UNITS when the change contains no change units.