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Updating the value of a column within a row in one table from a value obtained from a related row, or group of rows, from another table was not added until V4R3. Are you running V4R3? With V4R3 I am able to do the following: CREATE TABLE ROB/HEADER (KEYFIELD DEC (7, 0) NOT NULL WITH DEFAULT, COUNTDTL DEC (7, 0) NOT NULL WITH DEFAULT) INSERT INTO ROB/HEADER VALUES(1, 0) INSERT INTO ROB/HEADER VALUES(2, 0) CREATE TABLE ROB/DETAIL (KEYFIELD DEC (7, 0) NOT NULL WITH DEFAULT, LINEKEY DEC (7, 0) NOT NULL WITH DEFAULT) INSERT INTO ROB/DETAIL VALUES(1, 1) INSERT INTO ROB/DETAIL VALUES(1, 2) INSERT INTO ROB/DETAIL VALUES(1, 3) INSERT INTO ROB/DETAIL VALUES(2, 1) INSERT INTO ROB/DETAIL VALUES(2, 2) update rob/header set countdtl = (select count(*) from rob/detail where header.keyfield = detail.keyfield) select * from rob/header And I'll see: KEYFIELD COUNTDTL 1 3 2 2 +--- | This is the Midrange System Mailing List! | To submit a new message, send your mail to MIDRANGE-L@midrange.com. | To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com. | To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: david@midrange.com +---
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