diff --git a/trytond/model/fields/many2many.py b/trytond/model/fields/many2many.py
index 67a011e0fe..57ad8cb86c 100644
--- a/trytond/model/fields/many2many.py
+++ b/trytond/model/fields/many2many.py
@@ -453,7 +453,10 @@ class Many2Many(Field):
             relation_domain, tables=relation_tables)
         query_table = convert_from(None, relation_tables)
         query = query_table.select(origin, where=expression)
-        return table.id.in_(query)
+        expression = table.id.in_(query)
+        if operator.startswith('!') or operator.startswith('not '):
+            expression |= ~table.id.in_(relation.select(origin))
+        return expression
 
     def definition(self, model, language):
         encoder = PYSONEncoder()
diff --git a/trytond/model/fields/one2many.py b/trytond/model/fields/one2many.py
index b613251b91..530e469828 100644
--- a/trytond/model/fields/one2many.py
+++ b/trytond/model/fields/one2many.py
@@ -354,6 +354,8 @@ class One2Many(Field):
 
         if operator == 'not where':
             expression = ~expression
+        elif operator.startswith('!') or operator.startswith('not '):
+            expression |= ~table.id.in_(target.select(origin))
         return expression
 
     def definition(self, model, language):
diff --git a/trytond/tests/test_field_many2many.py b/trytond/tests/test_field_many2many.py
index 8a42d44043..84f8ebec5f 100644
--- a/trytond/tests/test_field_many2many.py
+++ b/trytond/tests/test_field_many2many.py
@@ -39,6 +39,21 @@ class CommonTestCaseMixin:
 
         self.assertListEqual(many2manys, [many2many])
 
+    @with_transaction()
+    def test_search_equals_no_link(self):
+        "Test search many2many equals without link"
+        Many2Many = self.Many2Many()
+        many2many, no_link = Many2Many.create([{
+                    'targets': [('create', [{'name': "Target"}])],
+                    }, {
+                    }])
+
+        many2manys = Many2Many.search([
+                ('targets', '=', "Target"),
+                ])
+
+        self.assertListEqual(many2manys, [many2many])
+
     @with_transaction()
     def test_search_non_equals(self):
         "Test search many2many non equals"
@@ -85,6 +100,21 @@ class CommonTestCaseMixin:
 
         self.assertListEqual(many2manys, [many2many1])
 
+    @with_transaction()
+    def test_search_non_equals_no_link(self):
+        "Test search many2many non equals without link"
+        Many2Many = self.Many2Many()
+        many2many, no_link = Many2Many.create([{
+                    'targets': [('create', [{'name': "Target"}])],
+                    }, {
+                    }])
+
+        many2manys = Many2Many.search([
+                ('targets', '!=', "Target"),
+                ])
+
+        self.assertListEqual(many2manys, [no_link])
+
     @with_transaction()
     def test_search_in(self):
         "Test search many2many in"
diff --git a/trytond/tests/test_field_one2many.py b/trytond/tests/test_field_one2many.py
index 7abe51490a..9566a89662 100644
--- a/trytond/tests/test_field_one2many.py
+++ b/trytond/tests/test_field_one2many.py
@@ -101,6 +101,21 @@ class CommonTestCaseMixin:
 
         self.assertListEqual(one2manys, [one2many])
 
+    @with_transaction()
+    def test_search_equals_no_link(self):
+        "Test search one2many equals without link"
+        One2Many = self.One2Many()
+        one2many, no_link = One2Many.create([{
+                    'targets': [('create', [{'name': "Target"}])],
+                    }, {
+                    }])
+
+        one2manys = One2Many.search([
+                ('targets', '=', "Target"),
+                ])
+
+        self.assertListEqual(one2manys, [one2many])
+
     @with_transaction()
     def test_search_non_equals(self):
         "Test search one2many non equals"
@@ -147,6 +162,21 @@ class CommonTestCaseMixin:
 
         self.assertListEqual(one2manys, [one2many1])
 
+    @with_transaction()
+    def test_search_non_equals_no_link(self):
+        "Test search one2many non equals without link"
+        One2Many = self.One2Many()
+        one2many, no_link = One2Many.create([{
+                    'targets': [('create', [{'name': "Target"}])],
+                    }, {
+                    }])
+
+        one2manys = One2Many.search([
+                ('targets', '!=', "Target"),
+                ])
+
+        self.assertListEqual(one2manys, [no_link])
+
     @with_transaction()
     def test_search_in(self):
         "Test search one2many in"