Using uppercase letter for group item (capital letter)

Hi all,

It took me at least 2 hours to find out that the group switch did not work with uppercase letter for item names.

This works:

Switch Licht_KG_Flur	"Licht Flur & Treppe"		(KG_Flur, Licht, gTestKeller)	[ "Lighting" ]	{knx="1/2/1"}
Switch Licht_KG_HWR	"Licht HWR"			(KG_HWR,  Licht, gTestKeller)	[ "Lighting" ]	{knx="1/2/6"}

Group:Switch:OR(ON, OFF) gTestKeller  "Test Gruppe Licht Keller [(%d)]"  <light> 

This doesn´t work

Switch Licht_KG_Flur	"Licht Flur & Treppe"		(KG_Flur, Licht, TestKeller)	[ "Lighting" ]	{knx="1/2/1"}
Switch Licht_KG_HWR	"Licht HWR"			(KG_HWR,  Licht, TestKeller)	[ "Lighting" ]	{knx="1/2/6"}

Group:Switch:OR(ON, OFF) TestKeller  "Test Gruppe Licht Keller [(%d)]"  <light> 

Is this limitation only valid here? or on other sections too?

Best regards
Timo