diff --git a/subjects/forms.py b/subjects/forms.py
index 3596053..cfd0e78 100644
--- a/subjects/forms.py
+++ b/subjects/forms.py
@@ -58,11 +58,11 @@ class CreateSubjectForm(forms.ModelForm):
 
     def clean_name(self):
         name = self.cleaned_data.get('name')
+        categoria = self.instance.category
         if self.instance.id:
-            same_name = Subject.objects.filter(name__unaccent__iexact = name).exclude(id = self.instance.id)
+            same_name = Subject.objects.filter(name__unaccent__iexact = name, category = categoria).exclude(id = self.instance.id)
         else:
-            same_name = Subject.objects.filter(name__unaccent__iexact = name)
-
+            same_name = Subject.objects.filter(name__unaccent__iexact = name, category = categoria)
         if same_name.count() > 0:
             self._errors['name'] = [_('There is another subject with this name, try another one.')]
 
@@ -161,11 +161,11 @@ class UpdateSubjectForm(forms.ModelForm):
 
     def clean_name(self):
         name = self.cleaned_data.get('name')
+        categoria = self.instance.category
         if self.instance.id:
-            same_name = Subject.objects.filter(name__unaccent__iexact = name).exclude(id = self.instance.id)
+            same_name = Subject.objects.filter(name__unaccent__iexact = name , category = categoria).exclude(id = self.instance.id)
         else:
-            same_name = Subject.objects.filter(name__unaccent__iexact = name)
-
+            same_name = Subject.objects.filter(name__unaccent__iexact = name).exclude(category = categoria)
         if same_name.count() > 0:
             self._errors['name'] = [_('There is another subject with this name, try another one.')]
 
--
libgit2 0.21.2