diff --git a/SprachkurseAdminPlugin.class.php b/SprachkurseAdminPlugin.class.php
index db2f3d638b907df7b7d6e5391f4c4d15e3c90cb9..7a89f3b4d0966a5aa152cd058238cad46abb24d0 100644
--- a/SprachkurseAdminPlugin.class.php
+++ b/SprachkurseAdminPlugin.class.php
@@ -161,31 +161,29 @@ class SprachkurseAdminPlugin extends StudipPlugin implements AdministrationPlugi
 
         if (strlen($_POST['givenname']))
         {
-            $search_parameters[] = "u.Vorname = ".$this->db->quote($_POST['givenname']);
+            $search_parameters[] = "Vorname = ".$this->db->quote($_POST['givenname']);
         }
         if (strlen($_POST['familyname']))
         {
-            $search_parameters[] = "u.Nachname = ".$this->db->quote($_POST['familyname']);
+            $search_parameters[] = "Nachname = ".$this->db->quote($_POST['familyname']);
         }
         if (strlen($_POST['username']))
         {
-            $search_parameters[] = "u.username = ".$this->db->quote($_POST['username']);
+            $search_parameters[] = "username = ".$this->db->quote($_POST['username']);
         }
         if (strlen($_POST['matrikel']))
         {
-            $search_parameters[] = "d.content = ".$this->db->quote($_POST['matrikel']);
+            $search_parameters[] = "matriculation_number = ".$this->db->quote($_POST['matrikel']);
         }
         if (count($search_parameters))
         {
-            $sql = "SELECT u.user_id,
-                u.username,
-                u.Vorname AS givenname,
-                u.Nachname AS familyname,
-                d.content AS matrikel,
-                u.locked
-                    FROM auth_user_md5 AS u
-                    LEFT JOIN datafields_entries AS d ON (d.range_id = u.user_id
-                            AND d.datafield_id = '6da14fb9d1c48d163a1530b1e5ca6eb4')
+            $sql = "SELECT user_id,
+                username,
+                Vorname AS givenname,
+                Nachname AS familyname,
+                matriculation_number AS matrikel,
+                locked
+                    FROM auth_user_md5
                     WHERE ".implode(" AND ", $search_parameters).
                     ' ORDER BY familyname, givenname, username';
             $result = $this->db->query($sql);
@@ -694,10 +692,7 @@ class SprachkurseAdminPlugin extends StudipPlugin implements AdministrationPlugi
 
             $user_ids = array();
 
-            // fuer diese query habe ich einen index in der DB angelegt... (datafield_id, contents)
-
-            $db->query("SELECT range_id FROM datafields_entries
-                    WHERE datafield_id='6da14fb9d1c48d163a1530b1e5ca6eb4' AND content = ".$this->db->quote($matrikel));
+            $db->query("SELECT user_id FROM auth_user_md5 WHERE matriculation_number = ".$this->db->quote($matrikel));
 
             if (!$db->next_record()
                     || $matrikel == null
@@ -717,7 +712,7 @@ class SprachkurseAdminPlugin extends StudipPlugin implements AdministrationPlugi
                     }
                 }
             } else {
-                $user_ids []= $db->f('range_id');
+                $user_ids []= $db->f('user_id');
             }
 
             if ($user_ids) {
@@ -893,9 +888,8 @@ class SprachkurseAdminPlugin extends StudipPlugin implements AdministrationPlugi
         $users = array();
         $users_waiting = array();
 
-        $users_result = $this->db->query("SELECT de.content as matrikel, au.Vorname, au.Nachname, au.user_id
+        $users_result = $this->db->query("SELECT au.matriculation_number as matrikel, au.Vorname, au.Nachname, au.user_id
                 FROM seminar_user as t
-                LEFT JOIN datafields_entries as de ON (t.user_id=de.range_id AND de.datafield_id = '6da14fb9d1c48d163a1530b1e5ca6eb4')
                 INNER JOIN auth_user_md5 as au ON (t.user_id = au.user_id)
                 WHERE t.Seminar_id = ".$this->db->quote($seminar_id)." AND t.status = 'autor' ORDER BY au.Nachname, au.Vorname");
 
@@ -910,9 +904,8 @@ class SprachkurseAdminPlugin extends StudipPlugin implements AdministrationPlugi
         }
 
         if (!$without_waiters) {
-            $users_awaiting_result = $this->db->query("SELECT de.content as matrikel, au.Vorname, au.Nachname, au.user_id
+            $users_awaiting_result = $this->db->query("SELECT au.matriculation_number as matrikel, au.Vorname, au.Nachname, au.user_id
                     FROM admission_seminar_user as t
-                    INNER JOIN datafields_entries as de ON (t.user_id=de.range_id AND de.datafield_id='6da14fb9d1c48d163a1530b1e5ca6eb4')
                     INNER JOIN auth_user_md5 as au ON (t.user_id = au.user_id)
                     WHERE t.seminar_id = ".$this->db->quote($seminar_id)." ORDER BY au.Nachname, au.Vorname");
 
diff --git a/SprachkurseCSVExport.class.php b/SprachkurseCSVExport.class.php
index 51a8464e33bf7f01a1574a29d4bdf28579087351..def9b6c1b423f89007f295267e53564ccca730d3 100644
--- a/SprachkurseCSVExport.class.php
+++ b/SprachkurseCSVExport.class.php
@@ -50,7 +50,7 @@ class SprachkurseCSVExport {
         $stmt = DBManager::get()->query($query = "SELECT pca.bankname, pca.bankleitzahl, pca.kontonummer, pca.kontoinhaber,
                 seminar_user.user_id, seminar_user.mkdate, seminar_user.status, seminar_user.comment,
                 s.Seminar_id, s.status as sem_type, s.ects, s.start_time, sab.grade,
-                au.Vorname, au.Nachname, dfe.content as matrikel, ui.geschlecht,
+                au.Vorname, au.Nachname, au.matriculation_number as matrikel, ui.geschlecht,
                 s.VeranstaltungsNummer, s.Name, s.ects
                 FROM seminare as s
                 LEFT JOIN seminar_user ON (seminar_user.status != 'dozent')
@@ -58,7 +58,6 @@ class SprachkurseCSVExport {
                 LEFT JOIN user_info as ui USING (user_id)
                 LEFT JOIN payable_courses_account as pca ON (pca.user_id = au.user_id)
                 LEFT JOIN sprachkurse_absolviert as sab ON (sab.user_id = au.user_id AND sab.seminar_id = s.Seminar_id)
-                LEFT JOIN datafields_entries as dfe ON (au.user_id = dfe.range_id AND dfe.datafield_id = '6da14fb9d1c48d163a1530b1e5ca6eb4')
                 WHERE s.Seminar_id = seminar_user.Seminar_id
                 AND s.Institut_id IN $i_id
                 AND s.start_time = '". $current_semester->beginn ."'");
diff --git a/SprachkurseCertificateGenerator.class.php b/SprachkurseCertificateGenerator.class.php
index ceadeb6b99b8c711dbdb76423b7dbf00aea83f0b..7a49f6b2a4ca994304ad3d48b1218c3e1f5fe4d2 100644
--- a/SprachkurseCertificateGenerator.class.php
+++ b/SprachkurseCertificateGenerator.class.php
@@ -102,7 +102,7 @@ class SprachkurseCertificateGenerator {
 
         $semester = $this->getSemester();
 
-        $query = "SELECT de.content as matrikel, au.Vorname, au.Nachname, s.Name as Seminartitel,
+        $query = "SELECT au.matriculation_number as matrikel, au.Vorname, au.Nachname, s.Name as Seminartitel,
                          s.ects as ectscredits, sp.user_id, sp.grade, au.username,
                          pcc.study_language as language, sp.certificate
                   FROM sprachkurse_absolviert as sp
@@ -111,8 +111,6 @@ class SprachkurseCertificateGenerator {
                   LEFT JOIN courseset_rule AS cr ON (sc.set_id = cr.set_id AND cr.type = 'PaycourseAdmission')
                   LEFT JOIN paycourse_admission_config as pcc ON (pcc.rule_id = cr.rule_id)
                   LEFT JOIN auth_user_md5 as au ON (sp.user_id = au.user_id)
-                  LEFT JOIN datafields_entries as de
-                      ON (sp.user_id = de.range_id AND de.datafield_id = '6da14fb9d1c48d163a1530b1e5ca6eb4')
                   WHERE sp.user_id = ? AND s.Seminar_id = ?";
 
         $stmt = DBManager::get()->prepare($query);
diff --git a/plugin.manifest b/plugin.manifest
index d312890deab69998560e1c65f26761005c9ad3c9..412b1841bb5198c35c50e3966ff4c10efb0fe9a7 100644
--- a/plugin.manifest
+++ b/plugin.manifest
@@ -3,8 +3,8 @@ pluginclassname=SprachkurseAdminPlugin
 pluginclassname=SprachkurseHomepagePlugin
 pluginname=Sprachenzentrum - Bezahlvorgang
 origin=virtUOS
-version=1.12
-studipMinVersion = 5.0
+version=1.13
+studipMinVersion = 5.5
 
 category = Bezahlkurse
 displayname = Bezahlkurse