Ensure enumerators can be used in event raising expressions (was prevented by predicate)

plugins/org.yakindu.sct.model.stext/src/org/yakindu/sct/model/stext/scoping/ContextPredicateProvider.java

@@ -162,7 +162,7 @@ public class ContextPredicateProvider {
 		filter.put(key(EVENT_RAISING_EXPRESSION), EVENTS);
 		filter.put(
 				key(EVENT_RAISING_EXPRESSION, EVENT_RAISING_EXPRESSION__VALUE),
-				VARIABLES_AND_OPERATIONS);
+				VARIABLES_OPERATIONS_EVENTS_ENUMERATORS);
 		filter.put(key(REGULAR_EVENT_SPEC), EVENTS);
 		filter.put(key(EVENT_VALUE_REFERENCE_EXPRESSION), EVENTS);
 		filter.put(key(REACTION_EFFECT), VARIABLES_AND_OPERATIONS);