error "The data types of the operands for the operation "=" are not compatible or comparable. SQLSTATE=42818 . (IES 10901) (WIS 10901)" in webi report BO 4.0

Hi,

I have the error "The data types of the operands for the operation "=" are not compatible or comparable.  SQLSTATE=42818. (IES 10901) (WIS 10901)"  when i generating the report with MORE THAN ONE OBJECTS. When i generate the report with ONLY ONE OBJECT i dont get any error message. plz find the SQL below

In UNIVERSE i have it as "DB2ADMIN.KA_COD.MASTER_VALUE". I would need to fix this in Universe level. i tried with changing the data type which is not works...

Please note that currently all objects i referring is CHARACTER type.

SELECT

  KA_COD_LKP_PrizeName.DESCRRIPTION

FROM

  (

  select DB2ADMIN.KA_COD.CATEGORY, substr(DB2ADMIN.KA_COD.MASTER_VALUE,locate(':',DB2ADMIN.KA_COD.MASTER_VALUE)+1,

length(DB2ADMIN.KA_COD.MASTER_VALUE)) as DESCRRIPTION,substr(DB2ADMIN.KA_COD.MASTER_CODE,locate('~',DB2ADMIN.KA_COD.MASTER_CODE)+1,

length(DB2ADMIN.KA_COD.MASTER_CODE))as code

from DB2ADMIN.KA_COD

  ) AS KA_COD_LKP_PrizeName,

  DB2ADMIN.KA_DT,

  DB2ADMIN.KA_PRM

WHERE

  ( DB2ADMIN.KA_PRM.PRIZE_TYPE= KA_COD_LKP_PrizeName.CODE  )

  AND  ( DB2ADMIN.KA_PRM.DATE_KEY=DB2ADMIN.KA_DT.DATE_KEY  )

  AND  ( KA_COD_LKP_PrizeName.CATEGORY='PromotionPrizeTypes'  )

  AND 

  DB2ADMIN.KA_DT.DATE_KEY  =  @prompt('Enter CDC:','N','Time Period\CDC',Mono,Free,Persistent,,User:0)

Can anyone plz check?