diff --git a/edi_core_oca/__manifest__.py b/edi_core_oca/__manifest__.py
index 2d91d84a0..6274a6c3c 100644
--- a/edi_core_oca/__manifest__.py
+++ b/edi_core_oca/__manifest__.py
@@ -9,7 +9,7 @@
     Define backends, exchange types, exchange records,
     basic automation and views for handling EDI exchanges.
     """,
-    "version": "18.0.1.6.3",
+    "version": "18.0.1.6.4",
     "website": "https://github.com/OCA/edi-framework",
     "development_status": "Beta",
     "license": "LGPL-3",
diff --git a/edi_core_oca/migrations/18.0.1.6.4/post-mig.py b/edi_core_oca/migrations/18.0.1.6.4/post-mig.py
new file mode 100644
index 000000000..6b52c0399
--- /dev/null
+++ b/edi_core_oca/migrations/18.0.1.6.4/post-mig.py
@@ -0,0 +1,24 @@
+# Copyright 2026 Camptocamp SA (http://www.camptocamp.com)
+# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl).
+
+from logging import getLogger
+
+from openupgradelib import openupgrade
+
+_logger = getLogger(__name__)
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    xmlid = "edi_core_oca.rule_edi_exchange_record_user"
+    if rule := env.ref(xmlid, False):
+        old_domain = (rule.domain_force or "").strip()
+        new_domain = ["|", ("model", "!=", False), ("res_id", "=", 0)]
+        _logger.info(
+            f"Updating {rule} ({xmlid=}) domain:\n"
+            f" - old: {old_domain}\n"
+            f" - new: {new_domain}"
+        )
+        rule.domain_force = new_domain
+    else:
+        _logger.warning(f"No rule found with XMLID '{xmlid}', skipping...")
diff --git a/edi_core_oca/security/ir_model_access.xml b/edi_core_oca/security/ir_model_access.xml
index 8c85f038b..31c9c73ae 100644
--- a/edi_core_oca/security/ir_model_access.xml
+++ b/edi_core_oca/security/ir_model_access.xml
@@ -122,7 +122,7 @@
         <field name="model_id" ref="edi_core_oca.model_edi_exchange_record" />
         <field
             name="domain_force"
-        >['|', ('model','!=', False), ('res_id', '=', False)]</field>
+        >['|', ('model', '!=', False), ('res_id', '=', 0)]</field>
         <field name="groups" eval="[(4, ref('base.group_user'))]" />
     </record>
     <record id="rule_edi_exchange_record_manager" model="ir.rule">
diff --git a/edi_core_oca/tests/test_security.py b/edi_core_oca/tests/test_security.py
index c0f7b1b9b..c26c62e4e 100644
--- a/edi_core_oca/tests/test_security.py
+++ b/edi_core_oca/tests/test_security.py
@@ -303,3 +303,35 @@ def test_search_pagination_with_inaccessible_middle_records(self):
 
         # The records fetched from the second page must be present in the final result
         self.assertIn(visible_id_2, records.ids)
+
+    def test_search_no_res_id(self):
+        """Test Exc Rec visibility for internal users when ``res_id`` is False-ish
+
+        Exchange Record's ``res_id`` is a ``Many2onReference`` field, which internally
+        converts False-ish values to 0 before storing them to the cache and the DB.
+        The rule's domain old leaf ``('res_id', '=', False)`` was instead converted to a
+        SQL query clause ``WHERE "edi_exchange_record.res_id" IS NULL``.
+        Since all ``edi_exchange_record`` rows contain a non-negative integer in the
+        ``res_id`` column, the rule old domain leaf always failed to fetch any record.
+
+        Changing the leaf to ``('res_id', '=', 0)`` fixes the issue, making such
+        Exchange Records visible again for internal users.
+        """
+        # Add the test user to the internal users group
+        self.user.write({"groups_id": [(4, self.env.ref("base.group_user").id)]})
+
+        # Create Exchange Records with no model (condition ``('model', '!=', False)``
+        # will fail) and False-ish record ID (to test condition ``('res_id', '=', 0)``):
+        # such False-ish values are all converted to 0 by ``fields.Many2oneReference``
+        # methods (and methods of its superclasses) when updating the cache values and
+        # preparing SQL queries to flush to the DB
+        exc_recs = self.env["edi.exchange.record"]
+        type_code = "test_csv_output"
+        vals = {"model": False}
+        for res_id in (0, 0.00, False, None, "", self.env["base"]):
+            exc_recs += self.backend.create_record(type_code, vals | {"res_id": res_id})
+        self.assertEqual(exc_recs.mapped("res_id"), [0] * len(exc_recs))
+
+        # Check that the test user can actually fetch such records
+        exc_recs_model = self.env["edi.exchange.record"].with_user(self.user)
+        self.assertEqual(exc_recs_model.search([("id", "in", exc_recs.ids)]), exc_recs)