[Евгений88]

А разве при этом:

SELECT WITH SELECT_ORDER, NESTED_LOOP, FORCE_PLACEHOLDERS INDEXISHINT
        SUM(PostedQty), SUM(PostedValue), SUM(PhysicalValue), SUM(Deducted), SUM(Registered),
        SUM(Received), SUM(Picked), SUM(ReservPhysical), SUM(ReservOrdered), SUM(OnOrder),
        SUM(Ordered), SUM(Arrived), SUM(QuotationReceipt), SUM(QuotationIssue), SUM(PhysicalInvent),
        SUM(PostedValueSecCur_RU), SUM(PhysicalValueSecCur_RU), SUM(AvailPhysical), SUM(AvailOrdered)
FROM InventSum
    USING INDEX ClosedItemDimIdx
    WHERE ((Closed = ))
JOIN INDEXISHINT *
FROM InventDim
    GROUP BY InventDim.InventLocationId ASC
    USING INDEX DimIdIdx
    WHERE InventSum.InventDimId = InventDim.inventDimId

JOIN ItemId, SotrOrder
FROM X_table
GROUP BY X_table.SotrOrder, X_table.ItemId ASC
WHERE X_table.ItemId = InventSum.ItemId

не произойдет "смыкание" по складу и соответствующее суммирование полей?!
Группировка по номенклатуре в InventSum не просто так ведь стоит.