Dimming DALI Device in KNX Enviroment

I need help in inplement a slider in sitemap for DALI light in KNX enviroment. Because i have
one ga for switching and one ga for dimming. I use the Siemens Dali Gateway N 141

My config is:

knx.items

Dimmer Wohneff_Schalter_W2 “WEffekt Licht” (gEG, Wohnzimmer, Lights) [“Erdgeschoß”] { channel=“knx:device:RASPI-EIB:TSM10B412_13:Channel_101” }

knx.things

            Thing device TSM10B412_13 "Wohnzimmer Schalter" @ "Wohnzimmer"               [ address="1.1.37", fetch=false, pingInterval=600, readInterval=0 ]
            {
                    Type    switch  :       Channel_100     "Wohnen Licht"        [ ga="1/1/50" ]
                    Type    dimmer  :       Channel_101     "Wohnen Dimmen"       [ switch="1/1/50", position="", increaseDecrease="3.007:1/1/51" ]

maybe some hint how to solve this Prob?

Please do not use relative dimming (CO13 and CO20, increaseDecrease parameter) but only absolute dimming (CD14/15 and CO21/22, position parameter)
Let’s say we have GA 1/1/60 for CO14, 1/1/61 for CO15, 1/1/62 for CO21 and 1/1/63 for CO22. The corresponding Thing would be

Thing device TSM10B412_13 "Wohnzimmer Dimmer" @ "Wohnzimmer" [
    address="1.1.37", 
    fetch=false, 
    pingInterval=600, 
    readInterval=0 ] {
        Type dimmer : Channel_101 "Wohnen Dimmen" [ switch="1/1/50", position="1/1/60+<1/1/61" ]
        Type dimmer : Channel_102 "Essen Dimmen" [ switch="1/1/52", position="1/1/62+<1/1/63" ]
    }

You don’t need no switch channel at all, as you can send an ON/OFF command to the dimmer channel.