facing issue with decode

[#1]

Hi....need to use IF-THEN-ELSE Condition for the below one....pls can any one help me to get this i'm totally new to qlikview....

DECODE(CHROMATIC_MODE, 'N/A', NULL, 'NA', NULL, CHROMATIC_MODE) AS CHROMATIC_MODE

Thanks & Regards,

SH.

[alexandros17]

     if((CHROMATIC_MODE = 'N/A' or CHROMATIC_MODE = 'NA', null(), CHROMATIC_MODE)