diff --git a/sternwarte/DB4js_all.php b/sternwarte/DB4js_all.php
index c166fac..9657db5 100644
--- a/sternwarte/DB4js_all.php
+++ b/sternwarte/DB4js_all.php
@@ -917,6 +917,68 @@ class RepoKalender
         DB::exec("DELETE FROM " . self::TBL . " WHERE id=?", [$id]);
         return true;
     }
+
+    public static function updateBeos(int $id, string $mitarbeiter): bool
+    {
+        // First, get the existing calendar entry
+        $existingEntry = DB::one("SELECT * FROM " . self::TBL . " WHERE id=?", [$id]);
+
+        if (!$existingEntry) {
+            error_log("RepoKalender::updateBeos - Calendar entry with ID {$id} not found.");
+            return false;
+        }
+
+        // Extract the original Sonderführung name from the existing title
+        // Expected format: "WK, SF [Sonderführung Name], [Old Mitarbeiter]"
+        $oldTitle = $existingEntry['title'];
+        $sofueName = '';
+        if (preg_match('/^WK, SF (.*), .*$/', $oldTitle, $matches)) {
+            $sofueName = trim($matches[1]);
+        }
+
+        $newTitle = '';
+        if (!empty($sofueName)) {
+            $newTitle = "WK, SF {$sofueName}, {$mitarbeiter}";
+        } else {
+            // Fallback: If we can't extract the original Sonderführung name,
+            // we'll try to keep the original structure if possible, or
+            // simply create a title indicating the BEO update.
+            // For now, let's just make it clear it's a BEO update.
+            $newTitle = "Kalender BEO: {$mitarbeiter}"; // More general fallback
+            error_log("RepoKalender::updateBeos - Could not parse original SF name from title '{$oldTitle}'. Using generic title fallback.");
+        }
+        
+        $sql = "UPDATE " . self::TBL . " SET title=? WHERE id=?";
+        DB::exec($sql, [$newTitle, $id]);
+        error_log("Kalender-Eintrag ID {$id} BEOs aktualisiert zu: {$mitarbeiter} (Titel: '{$newTitle}')");
+        return true;
+    }
+
+    public static function findEntryBySofueIdAndTermin(int $sofueId, string $wtermin): ?int
+    {
+        // Fetch Sonderführung details to get its name
+        $sofue = RepoSoFue::getById($sofueId);
+        if (!$sofue) {
+            error_log("RepoKalender::findEntryBySofueIdAndTermin - Sofue ID {$sofueId} not found.");
+            return null;
+        }
+
+        $sofueName = trim($sofue['name']);
+        $searchTitlePart = "WK, SF " . $sofueName; // We'll look for this part in the title
+
+        // Convert wtermin to YYYY-MM-DD H:i format for comparison with kalender.start
+        $terminDate = new DateTime($wtermin);
+        $startDateStr = $terminDate->format('Y-m-d H:i');
+
+        // Find calendar entry that matches the start date and contains the sofue name in its title
+        // Use LIKE for title matching because the full title includes the BEO's name which might change.
+        $sql = "SELECT id FROM " . self::TBL . " WHERE start = ? AND title LIKE ?";
+        $params = [$startDateStr, "%{$searchTitlePart}%"];
+        
+        $result = DB::one($sql, $params);
+        
+        return $result ? (int)$result['id'] : null;
+    }
 }
 
 // ---- Email Service (einfach) ----
@@ -1013,6 +1075,7 @@ class Commands
         'SENDMAIL2BEO' => 'Mail an Mitarbeiter',
         'SENDMAIL2LISTE' => 'Mail an Verteiler',
         'PUT2KALENDER' => 'Kalender-Eintrag',
+        'UPDATE_KALENDER_BEO' => 'Kalender-Eintrag BEOS aktualisieren',
         'GET_FDATES' => 'Führungstermine für Kalenderansicht',
         'GET_CALENTRIES' => 'Kalendereinträge abrufen',
         'PUT_CALENTRY' => 'Kalendereintrag erstellen',
@@ -1328,6 +1391,29 @@ Spendenbescheinigung: \t" . $info['spende'] . "
             ]);
             error_log('Kalender-Eintrag erstellt: ' . $input['id'] . ' ' . $input['termin'] . ' ' . $input['mitarbeiter']);
             respond(['success' => true]);
+
+        case 'UPDATE_KALENDER_BEO':
+            if (!isset($input['id'], $input['mitarbeiter'])) respondError('Missing fields for calendar update');
+            
+            $sofueId = (int)$input['id'];
+            $mitarbeiter = $input['mitarbeiter'];
+
+            // Fetch Sonderführung details to get wtermin
+            $sofue = RepoSoFue::getById($sofueId);
+            if (!$sofue) respondError('Sonderführung not found for calendar update', 404);
+
+            $wtermin = $sofue['wtermin'];
+            
+            // Find the calendar entry ID based on sofueId and wtermin
+            $kalenderId = RepoKalender::findEntryBySofueIdAndTermin($sofueId, $wtermin);
+
+            if (!$kalenderId) {
+                error_log("UPDATE_KALENDER_BEO: Could not find calendar entry for Sofue ID {$sofueId} and wtermin {$wtermin}.");
+                respondError('Corresponding calendar entry not found.', 404);
+            }
+
+            RepoKalender::updateBeos($kalenderId, $mitarbeiter);
+            respond(['success' => true]);
         case 'GET_FDATES':
             // Returns führungen for calendar display
             if (!isset($input['start'], $input['end'])) respondError('start and end required');
diff --git a/sternwarte/intern/sofue/js/sofue.js b/sternwarte/intern/sofue/js/sofue.js
index 308d6f8..0d47128 100644
--- a/sternwarte/intern/sofue/js/sofue.js
+++ b/sternwarte/intern/sofue/js/sofue.js
@@ -25,7 +25,7 @@ function checkFuehrung(was) {
 }
 
 //Übersicht über alle Stati
-//Jeweils nur 5 Einträge, kein Pager
+//Jeweils nur 5 Einträge, kein Pager/
 function uebersicht() {
 	for (var i=0; i< stati.length; i++) {
 		buildGrid(''+(i+1),15,false);
@@ -630,7 +630,7 @@ function sendmail2beo(id, beo, termin) {
 	doAjaxCall_arr(ajaxURL,cmd,showajaxerg);
 	console.log("Mail gesendet");
 	// und in den Kalender eintragen
-	cmd = {cmd: 'PUT2KALENDER', id: id, termin: termin, mitarbeiter: beo}
+	cmd = {cmd: 'UPDATE_KALENDER_BEO', id: id, mitarbeiter: beo}
 	doAjaxCall_arr(ajaxURL,cmd,showajaxerg);
 }