Through the lack of information I thought you want a sql. Hopefully it is what you need ... Have fun
CREATE COLUMN TABLE "XXX"."KNOBELN" ("ID" INTEGER CS_INT,
"VALUE" VARCHAR(1)) UNLOAD PRIORITY 5 AUTO MERGE ;
insert into "XXX"."KNOBELN" values(1,'A');
insert into "XXX"."KNOBELN" values(2,'B');
insert into "XXX"."KNOBELN" values(3,'C');
insert into "XXX"."KNOBELN" values(4,'K');
insert into "XXX"."KNOBELN" values(4,'C');
insert into "XXX"."KNOBELN" values(4,'B');
insert into "XXX"."KNOBELN" values(5,'A');
SELECT K1.VALUE, K2.VALUE FROM "XXX"."KNOBELN" K1 LEFT JOIN "XXX"."KNOBELN" K2 ON K1.ID = K2.ID
WHERE K1.ID IN (SELECT ID AS CNT FROM "XXX"."KNOBELN" GROUP BY ID HAVING COUNT(*) > 1 )
AND K1.VALUE <> K2.VALUE