diff --git a/eater/models/partner.py b/eater/models/partner.py
index 45adff3ec..3479151c0 100644
--- a/eater/models/partner.py
+++ b/eater/models/partner.py
@@ -51,15 +51,21 @@ def _check_parent_is_worker(self):
     def write(self, values):
         if values.get("parent_eater_id"):
             for partner in self:
-                if partner.parent_eater_id and partner.parent_eater_id != values.get(
-                    "parent_eater_id"
+                if (
+                    partner.parent_eater_id
+                    and partner.parent_eater_id.id != values.get("parent_eater_id")
                 ):
                     raise ValidationError(
                         _(
-                            "You try to assign a eater to a partner but this eater "
-                            "is already assign to %s please remove it before "
+                            "You are trying to assign %(eater)s as an eater to"
+                            " a new partner, but this eater is already"
+                            " assigned to %(old_partner)s. Please remove the link"
+                            " before creating a new one."
                         )
-                        % partner.parent_eater_id.name
+                        % {
+                            "eater": partner.name,
+                            "old_partner": partner.parent_eater_id.name,
+                        }
                     )
         return super().write(values)