do nothing delegation base approver

app/entities/migrations/0037_auto_20191112_1403.py

+# Generated by Django 2.2 on 2019-11-12 14:03
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('entities', '0036_auto_20191111_1549'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='changerequestformapprovers',
+            name='delegation',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.DO_NOTHING, to='entities.Delegation', to_field='code'),
+        ),
+        migrations.AlterField(
+            model_name='changerequesttemplateapprovers',
+            name='delegation',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.DO_NOTHING, to='entities.Delegation', to_field='code'),
+        ),
+    ]

app/entities/models.py

@@ -454,7 +454,7 @@ class BaseApprover(models.Model):
         Delegation,
         blank=True,
         null=True,
-        on_delete=models.PROTECT,
+        on_delete=models.DO_NOTHING,
         to_field='code')
     created = models.DateTimeField(
         blank=True,