Case Insensitive SELECT statement

hi expert.

this is my scenario.

i have one parameter in input for short description with name ZLTXA1

.

I HAVE THIS QUERY :

SELECT * FROM PLPO WHERE PLPO~LTXA1 LIKE  ZLTXA1.

.

FOR EXAMPLE I SEARCH FOR TEST .ONE TIME IN PLPO I HAVE TEST.IN ONE RECORD I HAVE Test and so on.

but i got just test in output.

how can i fix it?