DigitalStrom: Problem with GE-Device (gelb)?

Your KM-200 channels don’t look correct.
Please go to PaperUI -> Configuration -> Things and select your KM-200.
There You can see, how the Channels have to be defined and even you can copy the corrct definition to clipboard to paste it into your .items file.

I have changed the .items, but KM-200 is still not linked.
What is wrong?

.things
Bridge digitalstrom:dssBridge:302ed89f43f02ba00001011c [ ipAddress="10.0.0.12", userName="dssadmin", password="dssadmin", sensorDataUpdateInterval=180] 
{
  Thing digitalstrom:GE:GE-KM200 (digitalstrom:dssBridge:302ed89f43f02ba00001011c) [ dSID="303505d7f80000400003c1e7",  activePowerRefreshPriority="low", electricMeterRefreshPriority="medium", outputCurrentRefreshPriority="high"] 
    }

.items
//dSS
Number TotalActivePower     { channel="digitalstrom:dssBridge:302ed89f43f02ba00001011c:total_consumption_wh" }
Number TotalElectricMeter   { channel="digitalstrom:dssBridge:302ed89f43f02ba00001011c:total_energy_wh" }

//Light (KM-200)
Dimmer Brightness       { channel="digitalstrom:GE:302ed89f43f02ba00001011c:303505d7f80000400003c1e7:light_dimmer" }
Number ActivePower      { channel="digitalstrom:GE:302ed89f43f02ba00001011c:303505d7f80000400003c1e7:active_power" }
Number OutputCurrent    { channel="digitalstrom:GE:302ed89f43f02ba00001011c:303505d7f80000400003c1e7:output_current" }
Number ElectricMeter    { channel="digitalstrom:GE:302ed89f43f02ba00001011c:303505d7f80000400003c1e7:electric_meter" }

What is your logfile showing ?

events.log.xml (11.6 KB)
openhab.log.xml (5.5 KB)

Have a look. Is OK?

There is an issue with your Thing definition :

2017-12-28 13:35:50.390 [INFO ] [el.core.internal.ModelRepositoryImpl] - Validation issues found in configuration model 'home.things', using it anyway:
Provide a thing type ID and a thing ID in this format:
 <thingTypeId> <thingId>

As I don’t use manual config for digitalSTROM Binding, I can not assist you in solving this.
You could try cerating your digitalSTROM Things in PaperUI to see if it is workin in general.