diff --git a/odoo/addons/test_new_api/models.py b/odoo/addons/test_new_api/models.py
index 4b27de7d207..e6ad747097d 100644
--- a/odoo/addons/test_new_api/models.py
+++ b/odoo/addons/test_new_api/models.py
@@ -128,6 +128,7 @@ class Message(models.Model):
         search='_search_author_partner')
     important = fields.Boolean()
     label = fields.Char(translate=True)
+    priority = fields.Integer()
 
     @api.one
     @api.constrains('author', 'discussion')
@@ -186,6 +187,12 @@ class Message(models.Model):
     def _search_author_partner(self, operator, value):
         return [('author.partner_id', operator, value)]
 
+    @api.multi
+    def write(self, vals):
+        if 'priority' in vals:
+            vals['priority'] = 5
+        return super().write(vals)
+
 
 class EmailMessage(models.Model):
     _name = 'test_new_api.emailmessage'
diff --git a/odoo/addons/test_new_api/tests/test_new_fields.py b/odoo/addons/test_new_api/tests/test_new_fields.py
index f49aea62b1f..328a0f69ab8 100644
--- a/odoo/addons/test_new_api/tests/test_new_fields.py
+++ b/odoo/addons/test_new_api/tests/test_new_fields.py
@@ -52,6 +52,10 @@ class TestFields(common.TransactionCase):
         with self.assertRaises(ValueError):
             records.body = 'Faulty'
 
+        # field assigmenent does not cache the wrong value when write overridden
+        record.priority = 4
+        self.assertEqual(record.priority, 5)
+
     def test_10_computed(self):
         """ check definition of computed fields """
         # by default function fields are not stored and readonly
diff --git a/odoo/fields.py b/odoo/fields.py
index 16a13bedbe4..8d977e6cde3 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -1029,10 +1029,12 @@ class Field(MetaField('DummyField', (object,), {})):
                 spec += self.modified_draft(record)
             env.cache.invalidate(spec)
 
-        else:
+        elif (self.store or self.inverse or self.inherited):
             # Write to database
             write_value = self.convert_to_write(self.convert_to_record(value, record), record)
             record.write({self.name: write_value})
+
+        else:
             # Update the cache unless value contains a new record
             if not (self.relational and not all(value)):
                 record.env.cache.set(record, self, value)