eo_facture: invoice cancelation migration (#36633)

eo_gestion/eo_facture/migrations/0014_facture_annulation.py

@@ -0,0 +1,25 @@
+# Generated by Django 2.2.19 on 2021-12-10 10:54
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('eo_facture', '0013_contrat_tags'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='facture',
+            name='annulation',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name='factures_avoir',
+                to='eo_facture.Facture',
+            ),
+        ),
+    ]