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Q: Explain EIBRESP values

Answer:
EIBRESP holds response code. 0=NORMAL. Non-zero indicates condition. Use DFHRESP(condition) for comparison. Common: DFHRESP(NOTFND), DFHRESP(DUPKEY), DFHRESP(INVREQ). Check documentation.
eibresp codes response
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Q: How to handle DUPKEY?

Answer:
DUPKEY on WRITE means key exists. Check: IF ws-resp = DFHRESP(DUPKEY). Handle appropriately - maybe update instead. Or error to user. Common for insert logic.
dupkey error write