Rodrigo tenta isso e vê se funciona
SELECT C.REDUZIDO, C.DESCRICAO AS DESCRICAO_CONTA_CONTAB, (SUM(VLRDEBITO)-SUM(VLRCREDITO)) AS SALDO
FROM CRATEIOLC R INNER JOIN CCONTA C
ON C.CODCONTA=R.CODCONTA
AND R.DATA BETWEEN '2008-09-01' AND '2008-11-30'
AND C.REDUZIDO IN('10937', '10892', '10983', '11037', '11039', '11041', '10951', '10950', '11016', '10947', '11067', '11066', '10956', '11048', '10987', '11042', '11003', '10938', '10960', '10968', '11068', '12478')
INNER JOIN CGERENCIA G
ON G.CODCONTA=R.CODGERENCIAL
AND G.CODCONTA LIKE '1.1.7.06.000'
GROUP BY C.DESCRICAO, C.REDUZIDO