Can anyone figure out why I am getting the SQL 203 below ?

SELECT DISTINCT
SP.SPCLT_CD,
CASE CI.CORP_ENT_CD
WHEN 'IL1' THEN ' '
ELSE SP.PROV_TYP_CD
END AS XPROV_TYP_CD,
ST.PWN_STA_CD
FROM
TPSDB05.PAL_PFIN PP
INNER JOIN
TPSDB05.PWN_CI_PFIN CI
ON PP.PROV_ID = CI.PROV_ID
INNER JOIN
TPSDB05.PWN_SPCLT SP
ON CI.PROV_ID = SP.PROV_ID
AND CI.NWK_CD = SP.NWK_CD
AND CI.SUB_NWK_CD = SP.SUB_NWK_CD
AND CI.CORP_ENT_CD = SP.CORP_ENT_CD
INNER JOIN
TPSDB05.PWN_SPCLT SP
ON CI.PROV_ID = SP.PROV_ID
AND CI.NWK_CD = SP.NWK_CD
AND CI.SUB_NWK_CD = SP.SUB_NWK_CD
AND CI.CORP_ENT_CD = SP.CORP_ENT_CD
INNER JOIN
TPSDB05.PWN_STATUS ST
ON CI.PROV_ID = ST.PROV_ID
AND CI.NWK_CD = ST.NWK_CD
AND CI.SUB_NWK_CD = ST.SUB_NWK_CD
AND CI.CORP_ENT_CD = ST.CORP_ENT_CD
WHERE
PP.PROV_ID = 354664370 AND
CI.CORP_ENT_CD = 'OK1' AND
CI.NWK_CD IN
(SELECT CD_VAL
FROM TPSDB05.CODE_REF
WHERE CD_REF_NM = 'BRE03PCPA'
AND CORP_ENT_CD = 'OK1'
AND VLDT_IND = 'Y'
AND CD_EFDT <= '2006-08-21'
AND (CD_END_DT > '2006-08-21'

OR CD_END_DT IS NULL)) AND
CI.SUB_NWK_CD IN
(SELECT CD_VAL
FROM TPSDB05.CODE_RELSHP
WHERE CD_REF_NM = 'BREXTSUBN'
AND CORP_ENT_CD = 'OK1'
AND REL_CD_REF_NM = 'BREXTPCPA'
AND REL_CD_VAL = CI.NWK_CD
AND VLDT_IND = 'Y'
AND REL_CD_EFDT <= '2006-08-21'
AND (REL_CD_END_DT > '2006-08-21'
OR REL_CD_END_DT IS NULL)) AND
PP.ACTVN_DT <= '2006-08-21' AND
CI.VLDT_IND = 'Y' AND
CI.PWN_CI_PFIN_EFDT <= '2006-08-21' AND
( CI.PWN_CI_PFIN_END_DT IS NULL
OR CI.PWN_CI_PFIN_END_DT > '2006-08-21')
AND
SP.VLDT_IND = 'Y' AND
SP.SPCLT_CD IN
(SELECT CD_VAL
FROM TPSDB05.CODE_REF
WHERE CORP_ENT_CD = 'OK1'
AND CD_REF_NM = 'BRE03SPCLT'
AND VLDT_IND = 'Y'
AND CD_EFDT <= '2006-08-21'
AND (CD_END_DT > '2006-08-21'
OR CD_END_DT IS NULL)) AND
SP.PWN_SPCLT_EFDT <= '2006-08-21' AND
(SP.PWN_SPCLT_END_DT IS NULL
OR SP.PWN_SPCLT_END_DT > '2006-08-21')
AND
ST.VLDT_IND = 'Y' AND
ST.PWN_STA_EFDT <= '2006-08-21' AND
(ST.PWN_STA_END_DT IS NULL
OR ST.PWN_STA_END_DT > '2006-08-21');


DSNT404I SQLCODE = 203, WARNING: THE QUALIFIED COLUMN NAME SP.SPCLT_CD WAS
RESOLVED USING A NON-UNIQUE OR UNEXPOSED NAME
DSNT418I SQLSTATE = 01552 SQLSTATE RETURN CODE
DSNT415I SQLERRP = DSNXORSO SQL PROCEDURE DETECTING ERROR
DSNT416I SQLERRD = 0 0 1 1108504850 0 0 SQL DIAGNOSTIC INFORMATION
DSNT416I SQLERRD = X'00000000' X'00000000' X'00000001' X'42127112'
X'00000000' X'00000000' SQL DIAGNOSTIC INFORMATION

SPCLT_CD XPROV_TYP_CD PWN_STA_CD
---------+---------+---------+---------+---------+---------+---------+---------+
DSNE610I NUMBER OF ROWS DISPLAYED IS 0
DSNE616I STATEMENT EXECUTION WAS SUCCESSFUL, SQLCODE IS 100

I see the partappear twice, i.e., you are joining two tables with the same alias name "SP".
Most likely you must just remove those 6 lines.