Hi Ian,
Note 422264 is an internal note, which describes the fields of an internal BW table. We do not officially publish this, as we do not support internal tables and their descriptions.
Instead, we provide the technical business content which loads the data from these internal tables and is properly documented. So I would recommend to stick to this content.
Another important source for (parts of the) the statistics might be transaction ST03 (in expert mode - BW system load)
Kind Regards,
Alex PETER, SAP AG, Product Management BI
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