Index: kernel/application.php
===================================================================
--- kernel/application.php	(revision 15246)
+++ kernel/application.php	(working copy)
@@ -2031,6 +2031,18 @@
 	}
 
 	/**
+	 * Allows to process any type of event
+	 *
+	 * @param kEvent $event
+	 * @return bool
+	 * @access public
+	 */
+	public function eventImplemented(kEvent $event)
+	{
+		return $this->EventManager->eventImplemented($event);
+	}
+
+	/**
 	 * Registers new class in the factory
 	 *
 	 * @param string $real_class Real name of class as in class declaration
Index: kernel/event_handler.php
===================================================================
--- kernel/event_handler.php	(revision 15226)
+++ kernel/event_handler.php	(working copy)
@@ -104,10 +104,26 @@
 		 * Executes event, specified in $event variable
 		 *
 		 * @param kEvent $event
+		 * @return void
 		 * @access public
 		 */
 		public function processEvent(kEvent $event)
 		{
+			$event_name = $this->getEventMethod($event);
+
+			$this->$event_name($event);
+		}
+
+		/**
+		 * Returns method name, that should called to process given event.
+		 * When no such method exists and exception is thrown.
+		 *
+		 * @param kEvent $event
+		 * @return string
+		 * @throws Exception
+		 */
+		public function getEventMethod(kEvent $event)
+		{
 			$event_name = $event->Name;
 
 			if ( array_key_exists($event_name, $this->eventMethods) ) {
@@ -115,11 +131,10 @@
 			}
 
 			if ( method_exists($this, $event_name) ) {
-				$this->$event_name($event);
+				return $event_name;
 			}
-			else {
-				throw new Exception('Event <strong>' . $event->Name . '</strong> not implemented in class <strong>' . get_class($this) . '</strong>');
-			}
+
+			throw new Exception('Event "<strong>' . $event->Name . '</strong>" not implemented in class "<strong>' . get_class($this) . '</strong>"');
 		}
 
 		/**
Index: kernel/event_manager.php
===================================================================
--- kernel/event_manager.php	(revision 15226)
+++ kernel/event_manager.php	(working copy)
@@ -272,6 +272,25 @@
 	}
 
 	/**
+	 * Checks, that given event is implemented
+	 *
+	 * @param kEvent $event
+	 * @return bool
+	 * @access public
+	 */
+	public function eventImplemented(kEvent $event)
+	{
+		if ( !$this->verifyEventPrefix($event, true) ) {
+			return false;
+		}
+
+		$event_handler = $this->Application->recallObject($event->Prefix . '_EventHandler');
+		/* @var $event_handler kEventHandler */
+
+		return $event_handler->getEventMethod($event) != '';
+	}
+
+	/**
 	 * Checks if event prefix is valid
 	 *
 	 * @param kEvent $event
@@ -282,10 +301,11 @@
 	public function verifyEventPrefix($event, $is_fatal = false)
 	{
 		if ( !$this->Application->prefixRegistred($event->Prefix) ) {
+			// when "l-cdata" is requested, then load "l", that will clone "l-cdata" unit config
 			$this->Application->UnitConfigReader->loadConfig($event->Prefix);
 
 			if ( !$this->Application->prefixRegistred($event->Prefix) ) {
-				$error_msg = 'Prefix <strong>' . $event->Prefix . '</strong> not registred (requested event <strong>' . $event->Name . '</strong>)';
+				$error_msg = 'Prefix "<strong>' . $event->Prefix . '</strong>" not registred (requested event "<strong>' . $event->Name . '</strong>")';
 
 				if ($is_fatal) {
 					throw new Exception($error_msg);
Index: kernel/utility/event.php
===================================================================
--- kernel/utility/event.php	(revision 15226)
+++ kernel/utility/event.php	(working copy)
@@ -166,7 +166,7 @@
 						$this->Name = $regs[3];
 					}
 					else {
-						throw new Exception('Invalid event string: <strong>' . $params . '</strong>. $params should be "prefix[.special]:OnEvent" format');
+						throw new Exception('Invalid event string: "<strong>' . $params . '</strong>". Should be in "prefix[.special]:OnEvent" format');
 					}
 				}
 			}
Index: kernel/utility/unit_config_reader.php
===================================================================
--- kernel/utility/unit_config_reader.php	(revision 15226)
+++ kernel/utility/unit_config_reader.php	(working copy)
@@ -791,7 +791,7 @@
 	function loadConfig($prefix)
 	{
 		if ( !isset($this->prefixFiles[$prefix]) ) {
-			throw new Exception('Configuration file for prefix <strong>' . $prefix . '</strong> is unknown');
+			throw new Exception('Configuration file for prefix "<strong>' . $prefix . '</strong>" is unknown');
 
 			return ;
 		}
Index: units/scheduled_tasks/scheduled_task_eh.php
===================================================================
--- units/scheduled_tasks/scheduled_task_eh.php	(revision 15165)
+++ units/scheduled_tasks/scheduled_task_eh.php	(working copy)
@@ -36,6 +36,34 @@
 		}
 
 		/**
+		 * Does custom validation
+		 *
+		 * @param kEvent $event
+		 * @return void
+		 * @access protected
+		 */
+		protected function OnBeforeItemValidate(kEvent $event)
+		{
+			parent::OnBeforeItemValidate($event);
+
+			$object = $event->getObject();
+			/* @var $object kDBItem */
+
+			$event_string = $object->GetDBField('Event');
+
+			if ( !$event_string ) {
+				return;
+			}
+
+			try {
+				$this->Application->eventImplemented(new kEvent($event_string));
+			}
+			catch (Exception $e) {
+				$object->SetError('Event', 'invalid_event', '+' . $e->getMessage());
+			}
+		}
+
+		/**
 		 * [HOOK] Refreshes scheduled task list in database based on cached data from unit configs
 		 *
 		 * @param kEvent $event
Index: units/scheduled_tasks/scheduled_tasks_config.php
===================================================================
--- units/scheduled_tasks/scheduled_tasks_config.php	(revision 15165)
+++ units/scheduled_tasks/scheduled_tasks_config.php	(working copy)
@@ -115,7 +115,6 @@
 			),
 			'Event' => Array (
 				'type' => 'string', 'max_len' => 255,
-				'formatter' => 'kFormatter', 'regexp' => '/^[a-z-]*[.]{0,1}[a-z-]*:On[A-Za-z0-9]*$/',
 				'required' => 1, 'not_null' => 1, 'default' => ''
 			),
 			'RunInterval' => Array ('type' => 'int', 'required' => 1, 'not_null' => 1, 'default' => 0),