I created a trigger on a table like:
CREATE OR REPLACE TRIGGER AMS_RECD_UPD_XXXXX
AFTER UPDATE OF ASTGEN_FLG
ON AMS_RECD
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW.....
according to documentation, this trigger should only fire when value of ASTGEN_FLG is changed.
I am experiencing that this trigger fires whenever any column is updated.