Setpoint_heating and DecimalType

Hi

I have Danfoss thermostat in my network:

  <version>4</version>
  <manufacturer>0x2</manufacturer>
  <deviceId>0x4</deviceId>
  <deviceType>0x5</deviceType>

it is defined as item in my file:

Number PMarka_Danfoss_Temperatura "Grzejnik [%.0f C]" <temperature> (G_PMarka, G_Termostat) { channel="zwave:device:a7350a14:node6:thermostat_setpoint_heating" }

My problem is that whenever I tried to change value from UI (Paper, sitemap) it is not changed and in my logs I can see log as below:

2018-03-07 13:27:32.771 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 6: Command received zwave:device:a7350a14:node6:thermostat_setpoint_heating --> 1
2018-03-07 13:27:32.781 [WARN ] [ding.zwave.handler.ZWaveThingHandler] - NODE 6: No command converter set for command zwave:device:a7350a14:node6:thermostat_setpoint_heating type DecimalType
2018-03-07 13:27:33.573 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 6: Command received zwave:device:a7350a14:node6:thermostat_setpoint_heating --> 1
2018-03-07 13:27:33.576 [WARN ] [ding.zwave.handler.ZWaveThingHandler] - NODE 6: No command converter set for command zwave:device:a7350a14:node6:thermostat_setpoint_heating type DecimalType

Can anybody advice what should I do to correctly update value/state of thermostat from UI?

Cheers,
Piotr