diff --git a/classes/task/import_data.php b/classes/task/import_data.php
index 7c0754e..65e6f1b 100755
--- a/classes/task/import_data.php
+++ b/classes/task/import_data.php
@@ -69,21 +69,26 @@ class import_data extends \core\task\scheduled_task {
 	$filename = get_config('timetable', 'fname_substitution');
 	
 	if (!$filename || !file_exists($filename)) return;
-    if (($handle = fopen($filename, 'r')) == FALSE) return;
+	if (($handle = fopen($filename, 'r')) == FALSE) return;
 	$hash = hash_file('md5', $filename);
 	if ($hash == $filehash) return;
+	/*
 	$max_id = 0;
 	$max_changetime = 0;
 	if ($result = $DB->get_record_sql("select max(id), max(changetime) from {$CFG->prefix}timetable_substitution")) {
 	  $max_id = $result->{'max(id)'};
 	  $max_changetime = $result->{'max(changetime)'};
-    }
+	}
 	echo "Max id = $max_id\n";
 	echo "Max changetime = $max_changetime\n";
+	 */
 	try {
  	  $transaction = $DB->start_delegated_transaction();
-      while (($data = fgetcsv($handle, 1000, ',')) !== FALSE) {
-	    $dataobject = (object)array('id' 		=> $data[0], 
+	  echo "before delete\n";
+	  $DB->delete_records_select("timetable_substitution", "id>0");
+	  echo "after delete\n";
+	  while (($data = fgetcsv($handle, 1000, ',')) !== FALSE) {
+	      $dataobject = (object)array('id' 		=> $data[0], 
 		      			  'date'     		=> $data[1],
 		      			  'period'  		=> $data[2],
 		      			  'absence' 		=> $data[3],
@@ -104,19 +109,22 @@ class import_data extends \core\task\scheduled_task {
 		      			  'classb'   		=> utf8_encode($data[18]),
 		      			  'substitutiontype'   	=> $data[19],
 		      			  'changetime'   	=> $data[20],
-					  	  'unknown' 		=> $data[21]);
+					  'unknown' 		=> $data[21]);
 		//echo var_dump($dataobject);
 		foreach (get_object_vars($dataobject) as $key => $value) {
 		  if ($value=='') unset($dataobject->{$key});
 		}
+	        /*
 		if ($dataobject->id > $max_id) {
 		  $DB->insert_record_raw("timetable_substitution", $dataobject,false, false, true);
 		  echo "Object (id={$data[0]}) inserted\n";
 		} elseif ($dataobject->changetime >= $max_changetime) {
-	      $DB->update_record("timetable_substitution", $dataobject);
+		  $DB->update_record("timetable_substitution", $dataobject);
 		  echo "Object (id={$data[0]}) updated\n";
 		}
-      }
+		*/
+		$DB->insert_record_raw("timetable_substitution", $dataobject,false, false, true);
+	  }
 	  $transaction->allow_commit();
 	  fclose($handle);
 	  set_config('filehash_substitution', $hash, 'timetable');
@@ -248,4 +256,4 @@ class import_data extends \core\task\scheduled_task {
 	 $this->read_class();
   }
 
-}
\ No newline at end of file
+}