corrected Bug in DefaultNamingService that did errors in "StringExpressionTest" in C-Tests.

plugins/org.yakindu.sct.model.sexec/src/org/yakindu/sct/model/sexec/naming/DefaultNamingService.xtend

@@ -36,6 +36,7 @@ import org.yakindu.sct.model.sgraph.Statechart
 import org.yakindu.sct.model.sgraph.Vertex
 import org.yakindu.sct.model.stext.naming.StextNameProvider
 import org.yakindu.sct.model.stext.stext.TimeEventSpec
+import org.yakindu.sct.model.sexec.Reaction
 
 class StepDepthComparator implements Comparator<Step> {
 	@Inject
@@ -378,6 +379,20 @@ class DefaultNamingService implements INamingService {
 			case NameShorteningStrategy::INDEX_POSITION: return name?.removeVowels
 		}
 	}
+	
+	def protected dispatch String elementName(Reaction it, NameShorteningStrategy nameShorteningType) {
+		var String prefix;
+		if (it.transition) {
+			prefix = it.eContainer.elementName(nameShorteningType)
+		}
+		switch nameShorteningType {
+			case NameShorteningStrategy::FQN_NAME: return provider.getFullyQualifiedName(it).skipFirst(2).
+				toString(separator.toString)
+			case NameShorteningStrategy::SHORT_NAME: return prefix + name
+			case NameShorteningStrategy::REMOVE_VOWELS: return (prefix + name)?.removeVowels
+			case NameShorteningStrategy::INDEX_POSITION: return (prefix + name)?.removeVowels
+		}
+	}
 
 	def protected dispatch String elementName(ExecutionScope it, NameShorteningStrategy nameShorteningType) {
 		return sourceElement.elementName(nameShorteningType)