diff --git a/SAS/TMSS/backend/src/tmss/tmssapp/models/specification.py b/SAS/TMSS/backend/src/tmss/tmssapp/models/specification.py
index 29c8a71ef092e2eb6607ac8d691f4639efd1e880..7e3b5624af75cc7dd4e4a6787e7d7b9e8ff6304a 100644
--- a/SAS/TMSS/backend/src/tmss/tmssapp/models/specification.py
+++ b/SAS/TMSS/backend/src/tmss/tmssapp/models/specification.py
@@ -501,8 +501,8 @@ class SchedulingUnitBlueprint(RefreshFromDbInvalidatesCachedPropertiesMixin, Tem
         super().__init__(*args, **kwargs)
 
         # keep original scheduling constraints to detect changes on save
-        # todo: make this work for constraints_doc as well:
-        # self.__original_scheduling_constraints_doc = self.scheduling_constraints_doc
+        if 'scheduling_constraints_doc' in kwargs.keys():
+            self.__original_scheduling_constraints_doc = kwargs['scheduling_constraints_doc']
         self.__original_scheduling_constraints_template_id = self.scheduling_constraints_template_id
 
     def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
@@ -515,17 +515,14 @@ class SchedulingUnitBlueprint(RefreshFromDbInvalidatesCachedPropertiesMixin, Tem
                 if hasattr(self, 'draft'):
                     setattr(self, copy_field, getattr(self.draft, copy_field))
         else:
-            # On updates, prevent changing the scheduling contraints doc or template if we are past schedulable state
+            # On updates, prevent changing the scheduling constraints doc or template if we are past schedulable state
             if self.status not in [SchedulingUnitBlueprint.Status.DEFINED.value, SchedulingUnitBlueprint.Status.SCHEDULABLE.value] and \
-                    self.scheduling_constraints_template_id != self.__original_scheduling_constraints_template_id:
-                    # todo: make this work for constraints_doc as well:
-                    #(self.scheduling_constraints_doc != self.__original_scheduling_constraints_doc or
-                    # self.scheduling_constraints_template_id != self.__original_scheduling_constraints_template_id):
+                    (self.scheduling_constraints_doc != self.__original_scheduling_constraints_doc or
+                     self.scheduling_constraints_template_id != self.__original_scheduling_constraints_template_id):
                 raise TMSSException('The scheduling constraints of SchedulingUnitBlueprint pk=%s status=%s cannot be updated since it is not in defined or schedulable state.' % (self.pk, self.status))
 
         # update the original constraints value for comparison on next save
-        # todo: make this work for constraints_doc as well:
-        # self.__original_scheduling_constraints_doc = self.scheduling_constraints_doc
+        self.__original_scheduling_constraints_doc = dict(self.scheduling_constraints_doc)
         self.__original_scheduling_constraints_template_id = self.scheduling_constraints_template_id
 
         super().save(force_insert, force_update, using, update_fields)
diff --git a/SAS/TMSS/backend/test/t_tmssapp_specification_django_API.py b/SAS/TMSS/backend/test/t_tmssapp_specification_django_API.py
index aa6fd796b8cf1762186f795c6dd9114c5814e97a..94a2bfeed521ae4afddd4b9340147f88cc7075a2 100755
--- a/SAS/TMSS/backend/test/t_tmssapp_specification_django_API.py
+++ b/SAS/TMSS/backend/test/t_tmssapp_specification_django_API.py
@@ -472,7 +472,7 @@ class SchedulingUnitDraftTest(unittest.TestCase):
             models.SchedulingUnitDraft.objects.create(**test_data)
 
     def test_SchedulingUnitDraft_gets_created_with_correct_default_ingest_permission_required(self):
-        
+
         # setup
         entry = models.SchedulingUnitDraft.objects.create(**SchedulingUnitDraft_test_data())
         #check the auto_ingest on project
@@ -806,7 +806,6 @@ class SchedulingUnitBlueprintTest(unittest.TestCase):
         scheduling_unit_blueprint.scheduling_constraints_template = models.SchedulingConstraintsTemplate.objects.get(name="constraints_4")
         scheduling_unit_blueprint.save()
 
-    @unittest.skip('skipped until we fix detection for constraints doc changes')
     def test_SchedulingUnitBlueprint_prevents_updating_scheduling_constraints_doc_if_not_in_correct_state(self):
 
         # setup