Compile Error on Propputref

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Hi,

[propputref, id(5)]
HRESULT Parent([in] IBoundingBox* newVal);

When i compile with this method it produces the following error message.
But when i change propputref to propput it compiles ok.

.... \include\atlcom.h(1759) : error C2259: 'ATL::CComObject<Base>' : cannot
instantiate abstract class
with
[
Base=BoundingBox
]
due to following members:
'HRESULT IBoundingBox::putref_Parent(IBoundingBox *)' : pure virtual
function was not defined
BoundingBox.h(32) : see declaration of 'IBoundingBox::putref_Parent'

Thanks,
Rich.
.

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