Rule: item cannot be resolved, but item can be changed via sitemap

I have a strange thing going on: an item cannot be resolved in a rule, but can be changed via sitemap?

items:

/* Raum-Thermostate und -Regler */
Number RTR_EG_WoZi_HVAC_mode		"Betriebsart Wohnzimmer"		<temperature>		(RTR, EG_WoZi, gRTR_EG_WoZi)	[ "homekit:HeatingCoolingMode" ]	{ knx="5.005:8/5/1+<5.005:8/5/11" }
Number RTR_OG_Schlafen_HVAC_mode	"Betriebsart Schlafzimmer"		<temperature>		(RTR, OG_Schlafen, gRTR_OG_Schlafen) [ "homekit:HeatingCoolingMode" ]	{ knx="5.005:8/5/3+<5.005:8/5/13" }
Number RTR_OG_Bad_HVAC_mode		"Betriebsart Bad"			<temperature>		(RTR, OG_Bad, gRTR_OG_Bad)			[ "homekit:HeatingCoolingMode" ]	{ knx="5.005:8/5/2+<5.005:8/5/12" }
Number RTR_OG_KiZiOst_HVAC_mode		"Betriebsart Sarah"			<temperature>		(RTR, OG_KiZiOst, gRTR_OG_KiZiOst)		[ "homekit:HeatingCoolingMode" ] { knx="5.005:8/5/4+<5.005:8/5/14" }
Number RTR_OG_KiZiWest_HVAC_mode	"Betriebsart David"			<temperature>		(RTR, OG_KiZiWest, gRTR_OG_KiZiWest)		[ "homekit:HeatingCoolingMode" ] { knx="5.005:8/5/5+<5.005:8/5/15" }

sitemap:

	Frame label="Heizung" {
		Switch item=RTR_EG_WoZi_HVAC_mode mappings=[1="Komfort", 2="Standby", 3="Nacht", 4="Frost"]
		Switch item=RTR_OG_Schlafen_HVAC_mode mappings=[1="Komfort", 2="Standby", 3="Nacht", 4="Frost"]
		Switch item=RTR_OG_Bad_HVAC_mode mappings=[1="Komfort", 2="Standby", 3="Nacht", 4="Frost"]
		Switch item=RTR_OG_KiZiOst_HVAC_mode mappings=[1="Komfort", 2="Standby", 3="Nacht", 4="Frost"]
		Switch item=RTR_OG_KiZiWest_HVAC_mode mappings=[1="Komfort", 2="Standby", 3="Nacht", 4="Frost"]
	} 

rule

	if (WoZi == true && RTR_EG_WoZi_HVAC_mode.state != Heizmodus) {
		sendCommand(RTR_EG_WoZi_HVAC_mode, Heizmodus) 
		logInfo("Heizung", "Wohnzimmer Heizung wurde von " + RTR_EG_WoZi_HVAC_mode.state + " auf " + Heizmodus + " gestellt.")
	}
	if (Bad == true && RTR_OG_Bad_HVAC_mode.state != Heizmodus) {
		sendCommand(RTR_OG_Bad_HVAC_mode, Heizmodus) 
		logInfo("Heizung", "Bad Heizung wurde von " + RTR_OG_Bad_HVAC_mode.state + " auf " + Heizmodus + " gestellt.")
	}
	if (Schlafen == true && RTR_OG_Schlafen_HVAC_mode.state != Heizmodus) {
		sendCommand(RTR_OG_Schlafen_HVAC_mode, Heizmodus) 
		logInfo("Heizung", "Schlafzimmer Heizung wurde von " + RTR_OG_Schlafen_HVAC_mode.state + " auf " + Heizmodus + " gestellt.")
	}
	if (KiziOst == true && RTR_OG_KiziOst_HVAC_mode.state != Heizmodus) {
		sendCommand(RTR_OG_KiziOst_HVAC_mode, Heizmodus) 
		logInfo("Heizung", "Kinderzimmer Ost Heizung wurde von " + RTR_OG_KiziOst_HVAC_mode.state + " auf " + Heizmodus + " gestellt.")
	}
	if (KiziWest == true && RTR_OG_KiziWest_HVAC_mode.state != Heizmodus) {
		sendCommand(RTR_OG_KiziWest_HVAC_mode, Heizmodus) 
		logInfo("Heizung", "Kinderzimmer West Heizung wurde von " + RTR_OG_KiziWest_HVAC_mode.state + " auf " + Heizmodus + " gestellt.")
	}

If I change the value via the sitemap, the item changes (17:44:11), the rule throws an error (17:43:00)
openhab.log:

2017-10-04 17:43:00.092 [ERROR] [ntime.internal.engine.ExecuteRuleJob] - Error during the execution of rule Binder Status - Heizungsanpassung: An error occurred during the script execution: The name 'RTR_OG_KiziOst_HVAC_mode' cannot be resolved to an item or type.
2017-10-04 17:44:11.405 [ItemCommandEvent          ] - Item 'RTR_OG_KiZiOst_HVAC_mode' received command 3
2017-10-04 17:44:11.817 [ItemStateChangedEvent     ] - RTR_OG_KiZiOst_HVAC_mode changed from 1 to 3

some hints, what I’m missing? -in the rule all the other items before “RTR_OG_KiZiOst_HVAC_mode” get resolved and are changed as expected - …KiZiOst… and …KiZiWest… are both failing. Are the names of those variables too long? (The Error is thrown at the if-condition already)

In your sitemap you use RTR_OG_KiZiOst_HVAC_mode but in the rule you use RTR_OG_KiziWest_HVAC_mode.

I bolded your error. The Z is uppercase for your Item but lower case in your Rule.

Designer is great at finding errors like this and using <ctrl><space> to automatically complete words in Rules means you don’t even have to fully type the names.

You will have the same error with RTR_OG_KiZiWest_HVAC_mode

Thank you so much! I really must have a look into OH-Designer. Using notetab++ and it would Highlight the string regardless upper-lower case! Thanks! That one did it!