SETPOINT: read current & write back new value to EIB/KNX => wrong GA

Hello,

I have configured an Item and a Sitemap

Number Temperatur_WZ_SOLL "Soll-Temperatur WZ [%.1f °C]" <WZ_SOLL> (Temperaturen, WZ, WZ_TEMPS) { knx="2/1/41+<2/1/43" }

Setpoint item=Temperatur_WZ_SOLL step=0.5 minValue=5 maxValue=30

OpenHab reads the value from the correct GA (2/1/43)

> 13:46:33.731 [DEBUG] [.KNXBindingDatapointReaderTask:58 ] - Autorefresh: Waiting for new item in reader queue
> 13:46:33.731 [DEBUG] [.KNXBindingDatapointReaderTask:60 ] - Autorefresh: got new item Temperatur_WZ_SOLL in reader queue
> 13:46:33.731 [DEBUG] [.KNXBindingDatapointReaderTask:64 ] - Autorefresh: Trying to read form KNX bus: command DP 2/1/43 Temperatur_WZ_SOLL, DPT main 0 id 9.001, low priority
> 13:46:33.731 [DEBUG] [.KNXBindingDatapointReaderTask:92 ] - Autorefresh: Sending read request to KNX for item 'Temperatur_WZ_SOLL' DPT '9.001'
> 13:46:33.731 [INFO ] [tuwien.auto.calimero :51 ] - [KNXBinding/DatapointReaderTask] link 192.168.4.200:3671: send message to 2/1/43, wait for confirmation
> 13:46:33.747 [INFO ] [tuwien.auto.calimero :51 ] - [KNXnet/IP receiver] link 192.168.4.200:3671: confirmation of 2/1/43
> 13:46:33.793 [DEBUG] [.b.knx.internal.bus.KNXBinding:169 ] - Received groupWrite Event.
> 13:46:33.793 [DEBUG] [.KNXBindingDatapointReaderTask:70 ] - Autorefresh: DatapointReaderTask Waiting 50 msecs to prevent KNX bus overload
> 13:46:33.793 [INFO ] [tuwien.auto.calimero :51 ] - [KNXnet/IP receiver] link 192.168.4.200:3671: indication from 1.1.70
> 13:46:33.809 [DEBUG] [.p.rrd4j.internal.RRD4jService:130 ] - Stored 'Temperatur_WZ_SOLL' with state '21.5' in rrd4j database

when I change the value via the setpoint buttons the new value is sent - but on the wrong GA

13:52:55.314 [DEBUG] [.p.rrd4j.internal.RRD4jService:130 ] - Stored 'Temperatur_WZ_SOLL' with state '22.0' in rrd4j database
13:52:55.314 [INFO ] [tuwien.auto.calimero :51 ] - [qtp7790902-103] link 192.168.4.200:3671: send message to 2/1/43, wait for confirmation
13:52:55.345 [INFO ] [tuwien.auto.calimero :51 ] - [KNXnet/IP receiver] link 192.168.4.200:3671: confirmation of 2/1/43
13:52:55.345 [DEBUG] [.b.knx.internal.bus.KNXBinding:138 ] - Wrote value '22.0' to datapoint 'command DP 2/1/43 Temperatur_WZ_SOLL, DPT main 0 id 9.001, low priority'
1

after restart of OpenHab the old value will be read correct from the bus

13:57:50.266 [DEBUG] [.KNXBindingDatapointReaderTask:60 ] - Autorefresh: got new item Temperatur_WZ_SOLL in reader queue
13:57:50.266 [DEBUG] [.KNXBindingDatapointReaderTask:64 ] - Autorefresh: Trying to read form KNX bus: command DP 2/1/43 Temperatur_WZ_SOLL, DPT main 0 id 9.001, low priority
13:57:50.266 [DEBUG] [.KNXBindingDatapointReaderTask:92 ] - Autorefresh: Sending read request to KNX for item 'Temperatur_WZ_SOLL' DPT '9.001'
13:57:50.266 [INFO ] [tuwien.auto.calimero :51 ] - [KNXBinding/DatapointReaderTask] link 192.168.4.200:3671: send message to 2/1/43, wait for confirmation
13:57:50.297 [INFO ] [tuwien.auto.calimero :51 ] - [KNXnet/IP receiver] link 192.168.4.200:3671: confirmation of 2/1/43
13:57:50.328 [DEBUG] [.b.knx.internal.bus.KNXBinding:169 ] - Received groupWrite Event.
13:57:50.328 [INFO ] [tuwien.auto.calimero :51 ] - [KNXnet/IP receiver] link 192.168.4.200:3671: indication from 1.1.70
13:57:50.328 [DEBUG] [.KNXBindingDatapointReaderTask:70 ] - Autorefresh: DatapointReaderTask Waiting 50 msecs to prevent KNX bus overload
13:57:50.344 [DEBUG] [.p.rrd4j.internal.RRD4jService:130 ] - Stored 'Temperatur_WZ_SOLL' with state '21.5' in rrd4j database

any ideas ?

regards
Andreas