In case anyone is confused as to what I'm trying to accomplish, it's an
outer join on line items where both sides match with no NULL items.
If my approach is poor, then I won't have to worry about question about
the exception.

SELECT po.ID, pb.ID
FROM
RPL_PO po
JOIN RPL_POBILL pb
ON pb.PO = po.ID
WHERE
NOT EXISTS (
SELECT 1
FROM RPL_PO_ITM poi
LEFT JOIN RPL_POBILL_ITM pbi
ON poi.NDC = pbi.NDC AND pbi.INVOICE = pb.ID
WHERE poi.PURCH_ORDER = po.ID
AND pbi.COST IS NULL
) AND
NOT EXISTS (
SELECT 1
FROM RPL_POBILL_ITM pbi
LEFT JOIN RPL_PO_ITM poi
ON pbi.NDC = poi.NDC AND poi.PURCH_ORDER = po.ID
WHERE pbi.INVOICE = pb.ID
AND poi.PRICE IS NULL
)


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