diff --git a/src/servala/core/migrations/0004_billingentity_odoo_fields.py b/src/servala/core/migrations/0004_billingentity_odoo_fields.py
new file mode 100644
index 0000000..bcfee2d
--- /dev/null
+++ b/src/servala/core/migrations/0004_billingentity_odoo_fields.py
@@ -0,0 +1,23 @@
+# Generated by Django 5.2 on 2025-05-26 05:08
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0003_alter_organization_namespace"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="billingentity",
+            name="odoo_company_id",
+            field=models.IntegerField(null=True),
+        ),
+        migrations.AddField(
+            model_name="billingentity",
+            name="odoo_invoice_id",
+            field=models.IntegerField(null=True),
+        ),
+    ]
diff --git a/src/servala/core/models/organization.py b/src/servala/core/models/organization.py
index 7ebda11..201a8b9 100644
--- a/src/servala/core/models/organization.py
+++ b/src/servala/core/models/organization.py
@@ -110,6 +110,13 @@ class BillingEntity(ServalaModelMixin, models.Model):
         max_length=100, blank=True, verbose_name=_("ERP reference")
     )
 
+    # Odoo IDs are nullable for creation, should never be null in practice
+    # The company ID points at a record of type res.partner with company_type=company
+    # The invoice ID points at a record of type res.partner with company_type=person,
+    # type=invoic, parent_id=company_id (the invoice address).
+    odoo_company_id = models.IntegerField(null=True)
+    odoo_invoice_id = models.IntegerField(null=True)
+
     class Meta:
         verbose_name = _("Billing entity")
         verbose_name_plural = _("Billing entities")