Use the target id to compute the filter clause of a O2M field compared to None

Closes #14373

trytond/trytond/model/fields/one2many.py

@@ -358,7 +358,7 @@ class One2Many(Field):
                     if self.filter:
                         query = Target.search(
                             self.filter, order=[], query=True)
-                        where &= origin.in_(query)
+                        where &= target.id.in_(query)
                     query = target.select(origin, where=where)
                     expression = ~table.id.in_(query)
                 else:

trytond/trytond/tests/test_field_one2many.py

@@ -611,6 +611,21 @@ class FieldOne2ManyTestCase(
         self.assertEqual(len(filtered.targets), 4)
         self.assertEqual(filtered_target.value, 3)
 
+    @with_transaction()
+    def test_search_equals_filter(self):
+        "Test search one2many equals with filter"
+        One2Many = Pool().get('test.one2many_filter')
+        one2many, = One2Many.create([{
+                    'targets': [('create', [{'value': 3}])],
+                    }])
+
+        one2manys = One2Many.search([('targets', '=', None)])
+        one2manys_filtered = One2Many.search(
+            [('filtered_targets', '=', None)])
+
+        self.assertListEqual(one2manys, [])
+        self.assertListEqual(one2manys_filtered, [])
+
     @with_transaction()
     def test_search_non_equals_filter(self):
         "Test search one2many non equals with filter"