Colour by attribute values - postgis connection

[gisaalter]

I have some trouble colouring by an attribute value i/c with a postgis 
connection. 
I want to colour the column cabuty by 3 unique values. 
For now I'm trying to make a layer like this: 

LAYER 
   NAME "b_cabu_postgis" 
   CONNECTIONTYPE postgis 
   CONNECTION "host=localhost port=5432 dbname=****** 
user=****** password=*******" 
   DATA "the_geom from b_cabu" 
   STATUS ON 
   TYPE POLYGON 
   DUMP TRUE 
   TEMPLATE "ttt" 
    CLASSITEM "cabuty" 
    CLASS 
          EXPRESSION "CL" 
        STYLE OUTLINECOLOR 0 0 255 
        END 
       EXPRESSION "OO" 
        STYLE OUTLINECOLOR 255 0 255 
        END 
     END 
    METADATA 
    "wms_title" "gebouwen" 
    "gml_include_items" "all" 
     END 
     PROJECTION 
     "init=epsg:31300" 
     END 
END 

Only the expression 'OO' is coloured, the objects corresponding with 
'CL' in the cabuty are not showing up...what am I doing wrong ? 

Thanks for helping out ! 

Steven 
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