Getting an error on KNX temperature items

I’m constantly getting errors using the following items from my GIRA KNX in the openhab.log:

2017-06-23 10:46:02.428 [INFO ] [g.knx.internal.dpt.KNXCoreTypeMapper] - Translator couldn't parse data for datapoint type '9.001' (KNXIllegalArgumentException).
2017-06-23 10:56:02.378 [INFO ] [g.knx.internal.dpt.KNXCoreTypeMapper] - Translator couldn't parse data for datapoint type '9.001' (KNXIllegalArgumentException).
2017-06-23 11:06:02.339 [INFO ] [g.knx.internal.dpt.KNXCoreTypeMapper] - Translator couldn't parse data for datapoint type '9.001' (KNXIllegalArgumentException).
2017-06-23 11:16:02.288 [INFO ] [g.knx.internal.dpt.KNXCoreTypeMapper] - Translator couldn't parse data for datapoint type '9.001' (KNXIllegalArgumentException).

in my items, the RTRs are configured with dpt 9.001:

Number RTR_EG_WoZi_actualTemp	"Ist Wohnzimmer  [%.1f °C]"	<temperature>	(RTR, EG_WoZi, dTemp)	{ knx="<9.001:8/1/1" }
Number RTR_EG_WoZi_setTemp	"Soll Wohnzimmer [%.1f °C]"	<temperature>	(RTR, EG_WoZi)		{ knx="9.001:8/1/2+<9.001:8/1/3" }

The items get constant updates in the Events.log:

2017-06-23 07:30:00.847 [ItemStateChangedEvent     ] - RTR_EG_WoZi_setTemp changed from 21.1 to 19.0
2017-06-23 07:22:12.588 [ItemCommandEvent          ] - Item 'RTR_EG_WoZi_actualTemp' received command 22.72

In the ETS, those RTRs are also configured as 9.001, 2-byte.

Now, is there any way to connect an error to a specific item? As far as I see, all KNX-GAs are configured the same, they all do update the items within OH2, but I get those errors every 10minutes, which is exactly the interval of automatic sending, I configured the RTRs (last entry reads: “interval time for automatic broadcasting”):

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