From e91b16b734b39ad7018d0d2acc5be8b6963c337e Mon Sep 17 00:00:00 2001
From: Raphael Collet <rco@odoo.com>
Date: Wed, 3 Oct 2018 15:11:10 +0200
Subject: [PATCH] [FIX] base: renaming of x2many fields

---
 odoo/addons/base/models/ir_model.py | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/odoo/addons/base/models/ir_model.py b/odoo/addons/base/models/ir_model.py
index 9eb065012ed..aa30446d240 100644
--- a/odoo/addons/base/models/ir_model.py
+++ b/odoo/addons/base/models/ir_model.py
@@ -697,11 +697,15 @@ class IrModelFields(models.Model):
                 field = getattr(obj, '_fields', {}).get(item.name)
 
                 if vals.get('name', item.name) != item.name:
-                    # We need to rename the column
+                    # We need to rename the field
                     item._prepare_update()
-                    if column_rename:
-                        raise UserError(_('Can only rename one field at a time!'))
-                    column_rename = (obj._table, item.name, vals['name'], item.index)
+                    if item.ttype in ('one2many', 'many2many'):
+                        # those field names are not explicit in the database!
+                        pass
+                    else:
+                        if column_rename:
+                            raise UserError(_('Can only rename one field at a time!'))
+                        column_rename = (obj._table, item.name, vals['name'], item.index)
 
                 # We don't check the 'state', because it might come from the context
                 # (thus be set for multiple fields) and will be ignored anyway.