diff --git a/application/views/system/infocenter/infocenterData.php b/application/views/system/infocenter/infocenterData.php
index ebfd1db37..d1ce87422 100644
--- a/application/views/system/infocenter/infocenterData.php
+++ b/application/views/system/infocenter/infocenterData.php
@@ -315,22 +315,15 @@
 				 WHERE tpl.app = '.$APP.'
 			) pl USING(person_id)
 	LEFT JOIN (
-				SELECT
+				SELECT DISTINCT ON (tbl_rueckstellung.person_id)
 					tbl_rueckstellung.person_id,
 					tbl_rueckstellung.datum_bis,
 					tbl_rueckstellung.status_kurzbz,
 					array_to_json(bezeichnung_mehrsprachig::varchar[])->>0 as bezeichnung
 				FROM public.tbl_rueckstellung
 				JOIN public.tbl_rueckstellung_status USING(status_kurzbz)
-				JOIN public.tbl_person sp ON tbl_rueckstellung.person_id = sp.person_id
-				WHERE tbl_rueckstellung.rueckstellung_id =
-				(
-					SELECT srueck.rueckstellung_id
-					FROM public.tbl_rueckstellung srueck
-					WHERE srueck.person_id = tbl_rueckstellung.person_id
-						AND datum_bis >= NOW()
-					ORDER BY srueck.datum_bis DESC LIMIT 1
-				)
+				WHERE tbl_rueckstellung.datum_bis >= NOW()
+				ORDER BY tbl_rueckstellung.person_id, tbl_rueckstellung.datum_bis DESC
 			) rueck ON rueck.person_id = p.person_id
 		 WHERE
 			EXISTS (
diff --git a/application/views/system/infocenter/onboardingData.php b/application/views/system/infocenter/onboardingData.php
index 5ee66fdde..bf126f283 100644
--- a/application/views/system/infocenter/onboardingData.php
+++ b/application/views/system/infocenter/onboardingData.php
@@ -24,22 +24,15 @@ $query = '
 					 WHERE tpl.app = '.$APP.'
 				 ) pl ON p.person_id = pl.person_id
 			LEFT JOIN (
-				SELECT
+					SELECT DISTINCT ON (tbl_rueckstellung.person_id)
 					tbl_rueckstellung.person_id,
 					tbl_rueckstellung.datum_bis,
 					tbl_rueckstellung.status_kurzbz,
 					array_to_json(bezeichnung_mehrsprachig::varchar[])->>0 as bezeichnung
 				FROM public.tbl_rueckstellung
-					JOIN public.tbl_rueckstellung_status USING(status_kurzbz)
-					JOIN public.tbl_person sp ON tbl_rueckstellung.person_id = sp.person_id
-				WHERE tbl_rueckstellung.rueckstellung_id =
-				(
-					SELECT srueck.rueckstellung_id
-					FROM public.tbl_rueckstellung srueck
-					WHERE srueck.person_id = tbl_rueckstellung.person_id
-						AND datum_bis >= NOW()
-					ORDER BY srueck.datum_bis DESC LIMIT 1
-				)
+				JOIN public.tbl_rueckstellung_status USING(status_kurzbz)
+				WHERE tbl_rueckstellung.datum_bis >= NOW()
+				ORDER BY tbl_rueckstellung.person_id, tbl_rueckstellung.datum_bis DESC
 			) rueck ON rueck.person_id = p.person_id
 		WHERE p.person_id NOT IN (SELECT person_id FROM public.tbl_prestudent)';
 
diff --git a/cis/testtool/login.php b/cis/testtool/login.php
index c909bcd4f..60447ee52 100644
--- a/cis/testtool/login.php
+++ b/cis/testtool/login.php
@@ -142,9 +142,9 @@ if (isset($_REQUEST['prestudent']))
 		}
 		if ($reihungstest_id != '' && $rt->load($reihungstest_id))
 		{
-			$pruefling_registered = new Pruefling();
-			$registered = $pruefling_registered->personRegisteredRT($ps->person_id, $rt->reihungstest_id, $ps->prestudent_id);
-			if ($rt->freigeschaltet && $registered)
+			$pruefling_exist = new Pruefling();
+			$alreadyInRT = $pruefling_exist->personAlreadyInRT($ps->person_id, $rt->reihungstest_id, $ps->prestudent_id);
+			if ($rt->freigeschaltet && !$alreadyInRT)
 			{
 				// regenerate Session ID after Login
 				session_regenerate_id();
@@ -284,7 +284,7 @@ if (isset($_REQUEST['prestudent']))
 			}
 			else
 			{
-				if (!$registered)
+				if ($alreadyInRT)
 				{
 					$alertmsg .= '<div class="alert alert-danger">'.$p->t('testtool/reihungstestNichtRegistriert').'</div>';
 				}
diff --git a/include/pruefling.class.php b/include/pruefling.class.php
index 4ba2153fd..1f2e05785 100644
--- a/include/pruefling.class.php
+++ b/include/pruefling.class.php
@@ -597,8 +597,7 @@ class pruefling extends basis_db
 			return false;
 		}
 	}
-
-	public function personRegisteredRT($person_id, $reihungstest_id, $prestudent_id)
+	public function personAlreadyInRT($person_id, $reihungstest_id, $prestudent_id)
 	{
 		$qry = "SELECT tbl_prestudent.prestudent_id
 				FROM public.tbl_rt_person
@@ -607,7 +606,7 @@ class pruefling extends basis_db
 						AND tbl_prestudentstatus.studienplan_id = tbl_rt_person.studienplan_id
 				WHERE tbl_rt_person.person_id = " . $this->db_add_param($person_id) . "
 					AND tbl_rt_person.rt_id = " . $this->db_add_param($reihungstest_id) . "
-					AND tbl_prestudent.prestudent_id = " . $this->db_add_param($prestudent_id) . "
+					AND tbl_prestudent.prestudent_id != " . $this->db_add_param($prestudent_id) . "
 				LIMIT 1";
 
 		if($result = $this->db_query($qry))
diff --git a/system/dbupdate_3.4.php b/system/dbupdate_3.4.php
index 4ddb38203..04d07c36b 100644
--- a/system/dbupdate_3.4.php
+++ b/system/dbupdate_3.4.php
@@ -92,6 +92,7 @@ require_once('dbupdate_3.4/68744_StV_settings.php');
 require_once('dbupdate_3.4/62889_reihungstest_ueberwachung_mit_constructor.php');
 require_once('dbupdate_3.4/71399_dashboard_update_widget_paths.php');
 require_once('dbupdate_3.4/71645_studvw_messagetab_ladezeit.php');
+require_once('dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php');
 
 // *** Pruefung und hinzufuegen der neuen Attribute und Tabellen
 echo '<H2>Pruefe Tabellen und Attribute!</H2>';
diff --git a/system/dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php b/system/dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php
new file mode 100644
index 000000000..97c44d57d
--- /dev/null
+++ b/system/dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php
@@ -0,0 +1,15 @@
+<?php
+if (! defined('DB_NAME')) exit('No direct script access allowed');
+
+if ($result = $db->db_query("SELECT * FROM pg_class WHERE relname='idx_tbl_benutzerfunktion_uid'"))
+{
+	if ($db->db_num_rows($result) == 0)
+	{
+		$qry = "CREATE INDEX idx_tbl_benutzerfunktion_uid ON public.tbl_benutzerfunktion USING btree (uid)";
+
+		if (! $db->db_query($qry))
+			echo '<strong>idx_tbl_benutzerfunktion_uid: ' . $db->db_last_error() . '</strong><br>';
+		else
+			echo 'Index idx_tbl_benutzerfunktion_uid angelegt<br>';
+	}
+}