compensation/forms/compensation.py

@@ -171,8 +171,8 @@ class NewCompensationForm(AbstractCompensationForm,
     def is_valid(self):
         valid = super().is_valid()
         intervention = self.cleaned_data.get("intervention", None)
-        valid &= not intervention.is_recorded
-        if not valid:
+        if intervention.is_recorded:
+            valid &= False
             self.add_error(
                 "intervention",
                 _("This intervention is currently recorded. You cannot add further compensations as long as it is recorded.")