SQL Late Join With Case - Help...

All - I'm having some trouble, and I hope someone can give me some assistance. I've scoured Google, and have only found stuff similar to what I already have.

My company has an old commercial ERP package. The package has a table called 'Lot_Bin_Tran' that tracks movements of parts based on the part number and a 'Tran_code' - a one-character field that represents what kind of transaction it is (receipt, shipment, inventory adjustment, etc...). Using those two pieces of information, you can join this single table to any of the tables that hold the information (such as receipts). I tried to write a left join from my transaction table to my primary tables to look for transaction records that have no corresponding records in the primary tables. Some SQL might be helpful here...


Code:


SELECTLBT.*
FROMLOT_BIN_TRANLBT(NOLOCK),
PRODUCEP(NOLOCK),
ORDERSO(NOLOCK),
ISSUESI(NOLOCK),
RECEIPTSR(NOLOCK),
LOT_BIN_XFERLBX(NOLOCK)
WHERELBT.PART_NO = 'OUR_PART_NUMBER_GOES_HERE'
AND
LBT.TRAN_NO *=
CASE LBT.TRAN_CODE
WHEN 'I' THEN I.issue_no
WHEN 'P' THEN P.prod_no
WHEN 'R' THEN R.receipt_no
WHEN 'S' THEN O.order_no
WHEN 'T' THEN LBX.tran_NO
END
AND
((I.ISSUE_NO IS NULL) AND (P.PROD_NO IS NULL) AND (R.RECEIPT_NO IS NULL) AND (O.ORDER_NO IS NULL) AND (LBX.TRAN_NO IS NULL))



when I run this, though - I get the following message...
Quote:
Msg 301, Level 16, State 1
Query contains an illegal outer-join request.

If I change the Left join to an inner join (using = instead of *=), I get a resultset, but not the one I want (since I can't detect nulls in all tables using inner join). Any ideas on how I can restructure?

Thanks!