diff --git a/account_commission/migrations/15.0.2.0.0/post-migration.py b/account_commission/migrations/15.0.2.0.0/post-migration.py
new file mode 100644
index 000000000..c259a6862
--- /dev/null
+++ b/account_commission/migrations/15.0.2.0.0/post-migration.py
@@ -0,0 +1,19 @@
+# Copyright 2024 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    """Fill new invoice_agent_line_id many2one from the old many2many agent_line
+    equivalent table. This table always contain only one record on standard use.
+    """
+    openupgrade.logged_query(
+        env.cr,
+        """
+        UPDATE commission_settlement_line csl
+        SET invoice_agent_line_id = agent_line_id
+        FROM settlement_agent_line_rel rel
+        WHERE rel.settlement_id = csl.id
+        """,
+    )