Mondrian 2.4.2: AggTable/AggMeasure vs CalculatedMember

Hi,

I'm trying to set up custom aggregated tables in our mondrian data warehouse.
I defined the custom aggregated table like this:

<Table>
<AggName name="..." ...>
<AggFactCount ...></AggFactCount>
<AggMeasure name="[Measures].[Example]" column="..."> </AggMeasureName>
</AggName>
</Table>

As long as [Measures].[Example] points to a <Measure name="Example" column="..." .../> item it works fine.
When it points to a <CalculatedMember name="Example" formula="..." ... /> then I get the following error message:
"Failed to find measure 'Example' for Cube 'ExampleCube'".

As far as I checked it online, this thing should be working for recent versions. We're using mondrian 2.4.2 which supports only Measures.
Do you know any workaround, sg. like defining a cache-table?

Thanks,
Tamas