diff --git a/SAS/TMSS/src/tmss/tmssapp/migrations/0001_initial.py b/SAS/TMSS/src/tmss/tmssapp/migrations/0001_initial.py
index 1b641d44adaca8060c9a407df54525d15ee8be5f..853e557fee83b99ee0474d32747485becc348e7b 100644
--- a/SAS/TMSS/src/tmss/tmssapp/migrations/0001_initial.py
+++ b/SAS/TMSS/src/tmss/tmssapp/migrations/0001_initial.py
@@ -1,4 +1,4 @@
-# Generated by Django 2.2.12 on 2020-08-18 15:02
+# Generated by Django 2.2.12 on 2020-08-19 07:08
 
 from django.conf import settings
 import django.contrib.postgres.fields
@@ -986,7 +986,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='schedulingunitdraft',
             name='observation_strategy_template',
-            field=models.ForeignKey(help_text='Observation Strategy Template used to create the requirements_doc.', on_delete=django.db.models.deletion.CASCADE, to='tmssapp.SchedulingUnitObservingStrategyTemplate'),
+            field=models.ForeignKey(help_text='Observation Strategy Template used to create the requirements_doc.', null=True, on_delete=django.db.models.deletion.CASCADE, to='tmssapp.SchedulingUnitObservingStrategyTemplate'),
         ),
         migrations.AddField(
             model_name='schedulingunitdraft',
diff --git a/SAS/TMSS/src/tmss/tmssapp/models/specification.py b/SAS/TMSS/src/tmss/tmssapp/models/specification.py
index dc2cea04da03901454477a878753e99cf7aca558..e9400ff59d15bb90c00d18953cb93e4183e9e0cf 100644
--- a/SAS/TMSS/src/tmss/tmssapp/models/specification.py
+++ b/SAS/TMSS/src/tmss/tmssapp/models/specification.py
@@ -379,7 +379,7 @@ class SchedulingUnitDraft(NamedCommon):
     generator_instance_doc = JSONField(null=True, help_text='Parameter value that generated this run draft (NULLable).')
     scheduling_set = ForeignKey('SchedulingSet', related_name='scheduling_unit_drafts', on_delete=CASCADE, help_text='Set to which this scheduling unit draft belongs.')
     requirements_template = ForeignKey('SchedulingUnitTemplate', on_delete=CASCADE, help_text='Schema used for requirements_doc.') # todo: 'schema'?
-    observation_strategy_template = ForeignKey('SchedulingUnitObservingStrategyTemplate', on_delete=CASCADE, help_text='Observation Strategy Template used to create the requirements_doc.')
+    observation_strategy_template = ForeignKey('SchedulingUnitObservingStrategyTemplate', on_delete=CASCADE, null=True, help_text='Observation Strategy Template used to create the requirements_doc.')
 
     def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
         if self.requirements_doc:
diff --git a/SAS/TMSS/test/t_tmssapp_specification_REST_API.py b/SAS/TMSS/test/t_tmssapp_specification_REST_API.py
index bc95e9ccebc694054c9bdc87772d8b5aab58e0bb..7f5a8f53f18e8d6354b013a2c6723f6dbde515bf 100755
--- a/SAS/TMSS/test/t_tmssapp_specification_REST_API.py
+++ b/SAS/TMSS/test/t_tmssapp_specification_REST_API.py
@@ -1119,7 +1119,7 @@ class SchedulingUnitDraftTestCase(unittest.TestCase):
         GET_OK_and_assert_equal_expected_response(self, url, schedulingunitdraft_test_data)
 
         test_patch = {"description": "This is a new and improved description",
-                      "requirements_doc": '{"para": "meter"}'}
+                      "requirements_doc": '{"foo": "barbar"}'}
 
         # PATCH item and verify
         PATCH_and_assert_expected_response(self, url, test_patch, 200, test_patch)
diff --git a/SAS/TMSS/test/tmss_test_data_rest.py b/SAS/TMSS/test/tmss_test_data_rest.py
index a62d9b51c566d31593e6f97d4c68baf2f285128e..72ae35943ab012631858c1dec94ebc25a25cfdd5 100644
--- a/SAS/TMSS/test/tmss_test_data_rest.py
+++ b/SAS/TMSS/test/tmss_test_data_rest.py
@@ -223,8 +223,8 @@ class TMSSRESTTestDataCreator():
             scheduling_unit_template = self.get_response_as_json_object(template_url)
             requirements_doc = get_default_json_object_for_schema(scheduling_unit_template['schema'])
 
-        if observation_strategy_template_url is None:
-            observation_strategy_template_url = self.post_data_and_get_url(self.SchedulingUnitObservingStrategyTemplate(scheduling_unit_template_url=template_url), '/scheduling_unit_observing_strategy_template/')
+        # if observation_strategy_template_url is None:
+        #     observation_strategy_template_url = self.post_data_and_get_url(self.SchedulingUnitObservingStrategyTemplate(scheduling_unit_template_url=template_url), '/scheduling_unit_observing_strategy_template/')
 
         return {"name": name,
                 "description": "This is my run draft",