TRANSLATE STRING TO LOWER CASE in Decision Task

[Rick Sample]

I have a string in a container &ZPERCENTTYPEAMOUNT&.
I want to lower case this string in the form but can't seem to get 
the correct format.
 
 
DATA: T(90) VALUE &ZPERCENTTYPEAMOUNT&,
STRING LIKE T.
STRING = T.
TRANSLATE STRING TO LOWER CASE.
WRITE / STRING.