diff --git a/sale_commission_geo_assign_product_domain/tests/test_sale_commission_geo_assign_product_domain.py b/sale_commission_geo_assign_product_domain/tests/test_sale_commission_geo_assign_product_domain.py
index 4b809d21e..3fe64ef88 100644
--- a/sale_commission_geo_assign_product_domain/tests/test_sale_commission_geo_assign_product_domain.py
+++ b/sale_commission_geo_assign_product_domain/tests/test_sale_commission_geo_assign_product_domain.py
@@ -92,6 +92,49 @@ def test_geo_assign(self):
         self.assertEqual(c_es.agent_ids, agent)
         self.assertEqual(c_es.commission_item_agent_ids.group_ids, self.cig_spain)
 
+    def test_geo_assign_twice(self):
+        c_it = self.partner_model.create(
+            {
+                "name": "Customer Italy",
+                "country_id": self.country_italy.id,
+                "state_id": self.state_genova.id,
+            }
+        )
+
+        agent = self.partner_model.create(
+            {
+                "name": "Agent Spain and Italy",
+                "agent": True,
+                "commission_id": self.commission_rules_restrict.id,
+                "allowed_commission_group_ids": [
+                    (6, 0, [self.cig_italy.id, self.cig_spain.id])
+                ],
+            }
+        )
+
+        self.commission_group_model.create(
+            [
+                {
+                    "partner_id": agent.id,
+                    "country_ids": [(6, 0, [self.country_italy.id])],
+                    "commission_group_ids": [(6, 0, [self.cig_italy.id])],
+                },
+                {
+                    "partner_id": agent.id,
+                    "state_ids": [(6, 0, [self.state_genova.id])],
+                    "commission_group_ids": [(6, 0, [self.cig_spain.id])],
+                },
+            ]
+        )
+
+        wizard = self.wizard_model.with_context(active_ids=c_it.ids).create({})
+
+        # Should not raise an error
+        wizard.geo_assign_partner()
+        self.assertEqual(c_it.agent_ids, agent)
+        self.assertIn(self.cig_italy.id, c_it.commission_item_agent_ids.group_ids.ids)
+        self.assertIn(self.cig_spain.id, c_it.commission_item_agent_ids.group_ids.ids)
+
     def test_change_commission_type(self):
         agent = self.partner_model.create(
             {
@@ -107,7 +150,7 @@ def test_change_commission_type(self):
                 "agent_zip_to": 31333,
             }
         )
-        self.assertNotEquals(agent.commission_type, "product_restricted")
+        self.assertNotEqual(agent.commission_type, "product_restricted")
 
         agent.write(
             {
diff --git a/sale_commission_geo_assign_product_domain/wizards/wizard_geo_assign_partner.py b/sale_commission_geo_assign_product_domain/wizards/wizard_geo_assign_partner.py
index e742da021..c65326716 100644
--- a/sale_commission_geo_assign_product_domain/wizards/wizard_geo_assign_partner.py
+++ b/sale_commission_geo_assign_product_domain/wizards/wizard_geo_assign_partner.py
@@ -13,21 +13,30 @@ def update_partner_data(self, partner, agent):
             for line in agent.commission_geo_group_ids:
                 if line.is_assignable(partner):
                     partner.agent_ids = [(4, agent.id)]
-                    partner.commission_item_agent_ids = [
-                        (
-                            0,
-                            0,
-                            {
-                                "agent_id": agent.id,
-                                "group_ids": [
-                                    (
-                                        6,
-                                        0,
-                                        line.mapped("commission_group_ids.id"),
-                                    )
-                                ],
-                            },
-                        )
-                    ]
+
+                    commission_item = partner.commission_item_agent_ids.filtered(
+                        lambda x: x.agent_id == agent
+                    )
+                    if commission_item:
+                        commission_item.group_ids = [
+                            (4, x) for x in line.mapped("commission_group_ids.id")
+                        ]
+                    else:
+                        partner.commission_item_agent_ids = [
+                            (
+                                0,
+                                0,
+                                {
+                                    "agent_id": agent.id,
+                                    "group_ids": [
+                                        (
+                                            6,
+                                            0,
+                                            line.mapped("commission_group_ids.id"),
+                                        )
+                                    ],
+                                },
+                            )
+                        ]
         else:
             super().update_partner_data(partner, agent)