diff --git a/src/main/java/org/gcube/vremanagement/executor/api/SmartExecutor.java b/src/main/java/org/gcube/vremanagement/executor/api/SmartExecutor.java
index d5f81ab..5410c05 100644
--- a/src/main/java/org/gcube/vremanagement/executor/api/SmartExecutor.java
+++ b/src/main/java/org/gcube/vremanagement/executor/api/SmartExecutor.java
@@ -13,6 +13,7 @@ import org.gcube.vremanagement.executor.exception.LaunchException;
 import org.gcube.vremanagement.executor.exception.PluginInstanceNotFoundException;
 import org.gcube.vremanagement.executor.exception.PluginNotFoundException;
 import org.gcube.vremanagement.executor.plugin.PluginState;
+import org.quartz.SchedulerException;
 
 /**
  * Service Endpoint Interface
@@ -48,6 +49,17 @@ public interface SmartExecutor {
 		InputsNullException, PluginNotFoundException, 
 		LaunchException, ExecutorException;
 	
+	/**
+	 * The method use the provided UUID as String to unschedule a previous 
+	 * scheduled task.
+	 * @param executionIdentifier UUID as String which identify the execution
+	 * @throws Exception if there is no execution identified by the provided 
+	 * UUID execution identifier as String
+	 */
+	@SOAPBinding(parameterStyle=ParameterStyle.WRAPPED)
+	public void unSchedule(String executionIdentifier) throws SchedulerException;
+	
+	
 	/**
 	 * The method use the provided UUID as String to retrieve the status of the 
 	 * associated execution