Converting From Oracle

I am porting some application from AIX/C/Oracle to Windows/C#2005/MS SQL 2000. I have one query which has been giving me problems in translation from Oracle to MS SQL. This query had some decode statements which I changed to CASE statements. It also has Oracle (+) join operator, from what I have found this translates into an *= or =* depending which side the (+) is on.

Here is the query before replacing (+)

SELECT CSUM_TERR_CODE,
INVM_COST_FLAG,
SUM((CASE CITM_PROPRD WHEN '200708' THEN 1 ELSE 0 END) * (CITM_QTY * CITM_PRICE)),
SUM(CITM_QTY * CITM_PRICE)
FROM ACC_CUST_SUM, ACC_CUST_ITEMS, ACC_INV_MSTR
WHERE CSUM_PROPRD BETWEEN '200701' AND '200708' AND
CSUM_COMP_CODE = 'A' AND
CSUM_EMPL_CODE = '85' AND
CSUM_PROPRD = CITM_PROPRD AND
CSUM_INV_SEQ = CITM_INV_SEQ AND
CITM_DEPT_CODE NOT IN ('TR', 'DTR') AND
CITM_COMP_CODE = INVM_COMP_CODE(+) AND
CITM_ITEM_CODE = INVM_ITEM_CODE(+) AND
INVM_COST_FLAG = 'C'
GROUP BY CSUM_TERR_CODE, INVM_COST_FLAG
UNION
SELECT CSUM_TERR_CODE,
(CASE INVM_COST_FLAG WHEN NULL THEN 'A'ELSE INVM_COST_FLAG END),
SUM((CASE CITM_PROPRD WHEN '200708' THEN 1 ELSE 0 END) * (CITM_QTY * CITM_PRICE)),
SUM(CITM_QTY * CITM_PRICE)
FROM ACC_CUST_SUM, ACC_CUST_ITEMS, ACC_INV_MSTR
WHERE CSUM_PROPRD BETWEEN '200701' AND '200708' AND
CSUM_COMP_CODE = 'A' AND
CSUM_EMPL_CODE = '85' AND
CSUM_PROPRD = CITM_PROPRD AND
CSUM_INV_SEQ = CITM_INV_SEQ AND
CITM_DEPT_CODE NOT IN ('TR', 'DTR') AND
CITM_COMP_CODE = INVM_COMP_CODE(+) AND
CITM_ITEM_CODE = INVM_ITEM_CODE(+) AND
(INVM_COST_FLAG = 'A' OR INVM_COST_FLAG IS NULL)
GROUP BY CSUM_TERR_CODE, INVM_COST_FLAG


and after replacing with *, I think I have them in the right place

SELECT CSUM_TERR_CODE,
INVM_COST_FLAG,
SUM((CASE CITM_PROPRD WHEN '200708' THEN 1 ELSE 0 END) * (CITM_QTY * CITM_PRICE)),
SUM(CITM_QTY * CITM_PRICE)
FROM ACC_CUST_SUM, ACC_CUST_ITEMS, ACC_INV_MSTR
WHERE CSUM_PROPRD BETWEEN '200701' AND '200708' AND
CSUM_COMP_CODE = 'A' AND
CSUM_EMPL_CODE = '85' AND
CSUM_PROPRD = CITM_PROPRD AND
CSUM_INV_SEQ = CITM_INV_SEQ AND
CITM_DEPT_CODE NOT IN ('TR', 'DTR') AND
CITM_COMP_CODE =* INVM_COMP_CODE AND
CITM_ITEM_CODE =* INVM_ITEM_CODE AND
INVM_COST_FLAG = 'C'
GROUP BY CSUM_TERR_CODE, INVM_COST_FLAG
UNION
SELECT CSUM_TERR_CODE,
(CASE INVM_COST_FLAG WHEN NULL THEN 'A'ELSE INVM_COST_FLAG END),
SUM((CASE CITM_PROPRD WHEN '200708' THEN 1 ELSE 0 END) * (CITM_QTY * CITM_PRICE)),
SUM(CITM_QTY * CITM_PRICE)
FROM ACC_CUST_SUM, ACC_CUST_ITEMS, ACC_INV_MSTR
WHERE CSUM_PROPRD BETWEEN '200701' AND '200708' AND
CSUM_COMP_CODE = 'A' AND
CSUM_EMPL_CODE = '85' AND
CSUM_PROPRD = CITM_PROPRD AND
CSUM_INV_SEQ = CITM_INV_SEQ AND
CITM_DEPT_CODE NOT IN ('TR', 'DTR') AND
CITM_COMP_CODE =* INVM_COMP_CODE AND
CITM_ITEM_CODE =* INVM_ITEM_CODE AND
(INVM_COST_FLAG = 'A' OR INVM_COST_FLAG IS NULL)
GROUP BY CSUM_TERR_CODE, INVM_COST_FLAG

The Oracle run fine, but when run on MS SQL I get the following error.
The table 'ACC_CUST_ITEMS' is an inner member of an outer-join clause. This is not allowed if the table also participates in a regular join clause.

Any ideas on how I can get this one working?

Thanks