In form personalization the condition evaluates to false for WHEN-VALIDATE-RECORD for using any rela

Hi,
I am facing problem in form personalization in invoice workbench form. For WHEN-VALIDATE-RECORD the condition always evaluates to false for writing any condition using relational operator.
Like   :INV_SUM_FOLDER.DOC_CATEGORY_CODE  !=  'ABC'  or  like :INV_SUM_FOLDER.DOC_CATEGORY_CODE  =  'ABC' ,or  like :INV_SUM_FOLDER.DOC_CATEGORY_CODE  NOT IN (  'ABC' ,'DEF')I have tried for any combination, but the condition always false.

Please give me any resolution on the same ASAP.

 Thanks,
Lakshmi