CASE
WHEN NVL( OPS_FUNDING_DETAILS.REQUESTED_TOT_AMT,0) IS NULL THEN '0'
ELSE NVL( OPS_FUNDING_DETAILS.REQUESTED_TOT_AMT,0) +
CASE WHEN NVL(OPS_FUNDING_DETAILS.OBLIGATED_TOT_AMT,0) IS NULL THEN '0'
ELSE NVL(OPS_FUNDING_DETAILS.OBLIGATED_TOT_AMT,0)
END
END OBLIG,