I'm receiving this The SELECT statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect. (Error 3141) when I try to run the below Union Query.

How can I fix the error?

SELECT DISTINCT CHESS_PROD_PO.ITEM,
NAME as VName,
VENDOR as V Num,
LTrim([PO_NUM]) AS poNUM,
PO_LINE as POLine,
PO_DEL_SCHED_DATE as POSched,
USER_DATE as PromDT,
MAT_SPEC as PGM,
Null as ONum,
Null as OLine,
Null as RLine,
Null as RecDT,
Null as agCodes
FROM (((CHESS_PROD_PO_DEL INNER JOIN CHESS_PROD_PO_HDR ON (CHESS_PROD_PO_DEL.PO_NUM = CHESS_PROD_PO_HDR.PO_NUM)
AND (CHESS_PROD_PO_DEL.PUR_CCN = CHESS_PROD_PO_HDR.PUR_CCN)) INNER JOIN CHESS_PROD_PO ON (CHESS_PROD_PO_DEL.PUR_CCN = CHESS_PROD_PO.PUR_CCN)
AND (CHESS_PROD_PO_DEL.PO_NUM = CHESS_PROD_PO.PO_NUM)
AND (CHESS_PROD_PO_DEL.PO_LINE = CHESS_PROD_PO.PO_LINE)) INNER JOIN CHESS_PROD_VEN_LOC ON (CHESS_PROD_PO_HDR.VENDOR = CHESS_PROD_VEN_LOC.VENDOR)
AND (CHESS_PROD_PO_HDR.PUR_LOC = CHESS_PROD_VEN_LOC.VEN_LOC)) INNER JOIN CHESS_PROD_ITEM ON (CHESS_PROD_PO.ITEM = CHESS_PROD_ITEM.ITEM)
AND (CHESS_PROD_PO.REVISION = CHESS_PROD_ITEM.REVISION)
WHERE (((CHESS_PROD_VEN_LOC.VEN_LOC)='PUR' Or (CHESS_PROD_VEN_LOC.VEN_LOC)='PUR1' Or (CHESS_PROD_VEN_LOC.VEN_LOC)='PUR2'))
UNION ALL SELECT CHESS_PROD_PO.ITEM,
Null as VName,
Null as V Num,
Null as poNUM,
Null as POLine,
Null as POSched,
Null as PromDt,
Null as PGM,
LTrim([ORDER_NUM]) AS ONum,
ORDER_LINE as OLine,
REC_LINE as RLine,
REC_DATE as RecDT,
RTrim([AGC]) AS agCodes
FROM CHESS_PROD_PO INNER JOIN (CHESS_PROD_REC_HIST INNER JOIN CHESS_PROD_RECH_HDR ON (CHESS_PROD_REC_HIST.CCN = CHESS_PROD_RECH_HDR.CCN)
AND (CHESS_PROD_REC_HIST.MAS_LOC = CHESS_PROD_RECH_HDR.MAS_LOC)
AND (CHESS_PROD_REC_HIST.RECEIVER = CHESS_PROD_RECH_HDR.RECEIVER)) ON (CHESS_PROD_PO.ITEM = CHESS_PROD_REC_HIST.ITEM)
AND (CHESS_PROD_PO.REVISION = CHESS_PROD_REC_HIST.REVISION)
AND (CHESS_PROD_PO.PO_NUM = CHESS_PROD_REC_HIST.ORDER_NUM)
AND (CHESS_PROD_PO.PO_LINE = CHESS_PROD_REC_HIST.ORDER_LINE)
AND (CHESS_PROD_PO.CCN = CHESS_PROD_REC_HIST.PUR_CCN)
WHERE (((CHESS_PROD_RECH_HDR.REC_DATE) Between #7/1/2006# And #7/31/2006# And (CHESS_PROD_RECH_HDR.REC_DATE) Is Not Null)
AND ((RTrim([CHESS_PROD_REC_HIST.AGC])) Like "PROP" Or (RTrim([CHESS_PROD_REC_HIST.AGC]))="PRO"))
ORDER BY CHESS_PROD_PO.ITEM;

I think NAME is a reserved word...

Also, I would avoid take out the space in:

Null as V num
->
Null AS Vnum

At first glance, I bet it doesn't like "V Num", and would recommend [V Num]

hth,
Aaron