Oracle : Ошибка ORA-19035

"Invalid select item of the query in newContextFromHierarchy()"
*Cause: The query does not have a number select item followed by an XMLType select item only.
*Action: Make sure the result set of the query used in the newContextFromHierarchy() must have only two selected items: the first item must be number type and the second item must be XMLType.

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