Oh, my fault, I did’nt reread the whole thread.
I changed it now to
rule "Process AC40"
when
Item AC40_Raw received update
then
val AC40corrected = AC40_Raw.state.toString.replace("<br>", "<br/>")
val AC40_TL300E02B01 = transform("XSLT", "AC40_TL300E02B01.xsl", AC40corrected)
// Process and post the tags and values to the appropriate Items
TL300E02B01.sendCommand (AC40_TL300E02B01)
end
But I’am still not error free.

==> /var/log/openhab2/openhab.log <==
2017-03-21 18:13:10.415 [WARN ] [.core.transform.TransformationHelper] - Cannot get service reference for transformation service of type XSLT
2017-03-21 18:13:10.418 [WARN ] [ore.transform.actions.Transformation] - No transformation service 'XSLT' could be found.
2017-03-21 18:13:10.427 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'Process AC40': The argument 'command' must not be null or empty.
When I relogin to karaf at the very top I have the follwoing errors:
2017-03-21 18:10:09.508 [WARN ] [.core.transform.TransformationHelper] - Cannot get service reference for transformation service of type REGEX
2017-03-21 18:10:09.511 [WARN ] [ab.binding.http.internal.HttpBinding] - Couldn't transform response because transformationService of type 'REGEX' is unavailable
2017-03-21 18:10:09.564 [WARN ] [.core.transform.TransformationHelper] - Cannot get service reference for transformation service of type XSLT
2017-03-21 18:10:09.568 [WARN ] [ore.transform.actions.Transformation] - No transformation service 'XSLT' could be found.
2017-03-21 18:10:09.578 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'Process AC40': The argument 'command' must not be null or empty.
2017-03-21 18:11:09.781 [WARN ] [.core.transform.TransformationHelper] - Cannot get service reference for transformation service of type REGEX
2017-03-21 18:11:09.786 [WARN ] [ab.binding.http.internal.HttpBinding] - Couldn't transform response because transformationService of type 'REGEX' is unavailable
2017-03-21 18:11:09.833 [WARN ] [.core.transform.TransformationHelper] - Cannot get service reference for transformation service of type XSLT
2017-03-21 18:11:09.838 [WARN ] [ore.transform.actions.Transformation] - No transformation service 'XSLT' could be found.
2017-03-21 18:11:09.848 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'Process AC40': The argument 'command' must not be null or empty.