your trigger is on the table TEST, but the update command is looking at a different table;
UPDATE S_ID SET STATUS ='Y'
WHERE SID in
(SELECT SID FROM TEST_CUST WHERE M_ID=:old."ID");
shouldn't that be TEST and not TEST_CUST?
otehrwise, you need to join TEST to TEST_CUST, and update SID from that combined results.
Lowell
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