This query returns 'no current record for fetch operation'

SELECT po.ID, pb.ID
FROM
RPL_PO po
JOIN RPL_POBILL pb
ON pb.PO = po.ID
WHERE
po.ID = ? AND
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
)

But these running the queries separately works.

SELECT po.ID, pb.ID
FROM
RPL_PO po
JOIN RPL_POBILL pb
ON pb.PO = po.ID
WHERE
po.ID = ?

/* plug in values returned above */
SELECT *
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

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