diff --git a/input/models.py b/input/models.py
index 3c8b91c..80cd895 100755
--- a/input/models.py
+++ b/input/models.py
@@ -19,6 +19,19 @@ class TermsConsentMixin(models.Model):
         abstract = True
 
 
+class RequestUrlMixin(models.Model):
+    """
+    Abstract mixin for adding an OTRS request URL field to admin models.
+
+    This field stores a direct link to the related OTRS ticket.
+    Note: OTRS links may contain semicolons, which must not be URL-encoded.
+    """
+    request_url = models.URLField(max_length=2000, null=True, verbose_name='Antrag (URL)')
+
+    class Meta:
+        abstract = True
+
+
 class Volunteer(models.Model):
     realname = models.CharField(max_length=200, null=True, verbose_name="Realname",
                                 help_text="Bitte gib deinen Vornamen und deinen Nachnamen ein.", default='')
@@ -244,7 +257,7 @@ def getProjectEnd(sender, instance, **kwargs):
 #        super(Travel, self).save(*args,**kwargs)
 
 #abstract base class for Library and IFG
-class Grant(Extern):
+class Grant(RequestUrlMixin, Extern):
     cost = models.CharField(max_length=10, verbose_name='Kosten',
                             help_text="Bitte gib die ungefähr zu erwartenden Kosten in Euro an.")
     notes = models.TextField(max_length=1000, blank=True, verbose_name='Anmerkungen',
@@ -361,7 +374,7 @@ DOMAIN_CHOICES = {'PEDIA': '@wikipedia.de',
                   'SOURCE': '@wikisource.de',
                   'VERSITY': '@wikiversity.de',}
 
-class Domain(Extern):
+class Domain(RequestUrlMixin, Extern):
     domain = models.CharField(max_length=10,
                               choices=DOMAIN_CHOICES.items(),
                               default='PEDIA')
@@ -406,7 +419,7 @@ PROJECT_CHOICE = {'PEDIA': 'Wikipedia',
 BC_VARIANT = {'PIC': 'mit Bild',
               'NOPIC': 'ohne Bild'}
 
-class BusinessCard(TermsConsentMixin, Extern):
+class BusinessCard(RequestUrlMixin, TermsConsentMixin, Extern):
     project = models.CharField(max_length=20, choices=PROJECT_CHOICE.items(),
                                default='PEDIA', verbose_name='Wikimedia-Projekt',
                                help_text='Für welches Wikimedia-Projekt möchtest Du Visitenkarten?')