diff --git a/tine20/Timetracker/Model/TimesheetFilter.php b/tine20/Timetracker/Model/TimesheetFilter.php
index f0bf996969b..15431959206 100644
--- a/tine20/Timetracker/Model/TimesheetFilter.php
+++ b/tine20/Timetracker/Model/TimesheetFilter.php
@@ -115,13 +115,7 @@ protected function _appendAclSqlFilter($_select)
         
         if (! $this->_isResolved) {
             // get all timeaccounts user has required grants for
-            $result = array();
-            foreach ($this->_requiredGrants as $grant) {
-                if ($grant != Timetracker_Model_TimeaccountGrants::BOOK_OWN) {
-                    $result = array_merge($result, Timetracker_Controller_Timeaccount::getInstance()->getRecordsByAcl($grant, TRUE));
-                }
-            }
-            $this->_validTimeaccounts = array_unique($result);
+            $this->_validTimeaccounts  = Timetracker_Controller_Timeaccount::getInstance()->getRecordsByAcl(array_filter($this->_requiredGrants, fn($grant) => $grant !== Timetracker_Model_TimeaccountGrants::BOOK_OWN), true);
             if (Tinebase_Core::isLogLevel(Zend_Log::TRACE)) Tinebase_Core::getLogger()->trace(__METHOD__ . '::' . __LINE__ 
                 . ' valid timeaccounts' . print_r($this->_validTimeaccounts, TRUE) . ' for required grants: ' . print_r($this->_requiredGrants, TRUE));
             $this->_isResolved = TRUE;
@@ -133,15 +127,11 @@ protected function _appendAclSqlFilter($_select)
         $where = $db->quoteInto("$field IN (?)", empty($this->_validTimeaccounts) ? array('') : $this->_validTimeaccounts);
         
         // get timeaccounts with *_OWN right
-        $bookOwnTS = [];
-        foreach ([
-                    Timetracker_Model_TimeaccountGrants::BOOK_OWN,
-                    Timetracker_Model_TimeaccountGrants::READ_OWN,
-                    Timetracker_Model_TimeaccountGrants::REQUEST_OWN,
-                ] as $grant) {
-            $bookOwnTS = array_merge($bookOwnTS, Timetracker_Controller_Timeaccount::getInstance()->getRecordsByAcl($grant, true));
-        }
-        $bookOwnTS = array_unique($bookOwnTS);
+        $bookOwnTS = Timetracker_Controller_Timeaccount::getInstance()->getRecordsByAcl([
+                Timetracker_Model_TimeaccountGrants::BOOK_OWN,
+                Timetracker_Model_TimeaccountGrants::READ_OWN,
+                Timetracker_Model_TimeaccountGrants::REQUEST_OWN,
+            ], true);
         if (! empty($bookOwnTS)) {
             $where .= ' OR (' . $db->quoteInto($field . ' IN (?)', $bookOwnTS)
                 . ' AND ' . $db->quoteInto($db->quoteIdentifier('account_id'). ' = ?', Tinebase_Core::getUser()->getId()) .')';
diff --git a/tine20/Tinebase/Controller/Record/Container.php b/tine20/Tinebase/Controller/Record/Container.php
index 22b3de7aae4..fa6ab178b8a 100644
--- a/tine20/Tinebase/Controller/Record/Container.php
+++ b/tine20/Tinebase/Controller/Record/Container.php
@@ -251,13 +251,7 @@ public function getRecordsByAcl($_grant, $_onlyIds = FALSE)
         // NOTE: use id filter instead of container filter because of poor performance of container filter (setValue)
         $filter->addFilter(new Tinebase_Model_Filter_Id('container_id', 'in', $containerIds));
 
-        $result = $this->_backend->search($filter);
-
-        if ($_onlyIds) {
-            $result = $result->getArrayOfIds();
-        }
-
-        return $result;
+        return $this->_backend->search($filter, null, $_onlyIds ? Tinebase_Backend_Sql_Abstract::IDCOL : Tinebase_Backend_Sql_Abstract::ALLCOL);
     }
 
     /**