diff --git a/intervention/forms/modalForms.py b/intervention/forms/modalForms.py
index f246a598..4d9abec4 100644
--- a/intervention/forms/modalForms.py
+++ b/intervention/forms/modalForms.py
@@ -10,16 +10,14 @@ from django.contrib.auth.models import User
 from django.db import transaction
 from django import forms
 from django.urls import reverse
-from django.utils.translation import  gettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
-from compensation.models import EcoAccount, EcoAccountDeduction
+from compensation.models import EcoAccount
 from intervention.inputs import TextToClipboardInput
-from intervention.models import Revocation, RevocationDocument, Intervention, InterventionDocument
+from intervention.models import Intervention, InterventionDocument
 from konova.forms import BaseModalForm, NewDocumentForm
 from konova.utils.general import format_german_float
-from konova.utils.messenger import Messenger
 from konova.utils.user_checks import is_default_group_only
-from user.models import UserActionLogEntry, UserAction
 
 
 class ShareInterventionModalForm(BaseModalForm):
@@ -118,13 +116,7 @@ class ShareInterventionModalForm(BaseModalForm):
         )
 
     def save(self):
-        still_accessing_users = self.cleaned_data["users"]
-        new_accessing_users = list(self.cleaned_data["user_select"].values_list("id", flat=True))
-        accessing_users = still_accessing_users + new_accessing_users
-        users = User.objects.filter(
-            id__in=accessing_users
-        )
-        self.instance.share_with_list(users)
+        self.instance.update_sharing_user(self)
 
 
 class NewRevocationModalForm(BaseModalForm):
diff --git a/intervention/models/intervention.py b/intervention/models/intervention.py
index 64949559..e75c215f 100644
--- a/intervention/models/intervention.py
+++ b/intervention/models/intervention.py
@@ -284,6 +284,25 @@ class Intervention(BaseObject, ShareableObjectMixin, RecordableObjectMixin, Chec
             )
         return deduction
 
+    def update_sharing_user(self, form):
+        """ Adds a new user with shared access to the intervention
+
+        Args:
+            form (ShareInterventionModalForm): The form holding the data
+
+        Returns:
+
+        """
+        form_data = form.cleaned_data
+
+        keep_accessing_users = form_data["users"]
+        new_accessing_users = list(form_data["user_select"].values_list("id", flat=True))
+        accessing_users = keep_accessing_users + new_accessing_users
+        users = User.objects.filter(
+            id__in=accessing_users
+        )
+        self.share_with_list(users)
+
 
 class InterventionDocument(AbstractDocument):
     """
diff --git a/konova/models/object.py b/konova/models/object.py
index ef07b33e..d62130cc 100644
--- a/konova/models/object.py
+++ b/konova/models/object.py
@@ -135,45 +135,6 @@ class BaseObject(BaseResource):
         )
         self.log.add(user_action)
 
-    def is_shared_with(self, user: User):
-        """ Access check
-
-        Checks whether a given user has access to this object
-
-        Args:
-            user ():
-
-        Returns:
-
-        """
-        if isinstance(self, ShareableObjectMixin):
-            return self.users.filter(id=user.id)
-        else:
-            return User.objects.none()
-
-    def share_with(self, user: User):
-        """ Adds user to list of shared access users
-
-        Args:
-            user (User): The user to be added to the object
-
-        Returns:
-
-        """
-        if not self.is_shared_with(user):
-            self.users.add(user)
-
-    def share_with_list(self, user_list: list):
-        """ Sets the list of shared access users
-
-        Args:
-            user_list (list): The users to be added to the object
-
-        Returns:
-
-        """
-        self.users.set(user_list)
-
     def generate_new_identifier(self) -> str:
         """ Generates a new identifier for the intervention object
 
@@ -398,4 +359,40 @@ class ShareableObjectMixin(models.Model):
             self.generate_access_token(make_unique, rec_depth)
         else:
             self.access_token = token
-            self.save()
\ No newline at end of file
+            self.save()
+
+    def is_shared_with(self, user: User):
+        """ Access check
+
+        Checks whether a given user has access to this object
+
+        Args:
+            user ():
+
+        Returns:
+
+        """
+        return self.users.filter(id=user.id)
+
+    def share_with(self, user: User):
+        """ Adds user to list of shared access users
+
+        Args:
+            user (User): The user to be added to the object
+
+        Returns:
+
+        """
+        if not self.is_shared_with(user):
+            self.users.add(user)
+
+    def share_with_list(self, user_list: list):
+        """ Sets the list of shared access users
+
+        Args:
+            user_list (list): The users to be added to the object
+
+        Returns:
+
+        """
+        self.users.set(user_list)