diff --git a/partner_nace/__openerp__.py b/partner_nace/__openerp__.py
index c90cdfcd7..a8b7bb8d0 100644
--- a/partner_nace/__openerp__.py
+++ b/partner_nace/__openerp__.py
@@ -35,7 +35,7 @@
         'wizard/nace_import_view.xml',
         'security/ir.model.access.csv',
     ],
-    'author': 'Antiun Ingeniería, SL',
+    'author': 'Antiun Ingeniería S.L.',
     'website': 'http://www.antiun.com',
     'license': 'AGPL-3',
     'installable': True,
diff --git a/partner_nace/models/res_partner.py b/partner_nace/models/res_partner.py
index d37cf78da..7464b9016 100644
--- a/partner_nace/models/res_partner.py
+++ b/partner_nace/models/res_partner.py
@@ -29,6 +29,7 @@ class ResPartner(models.Model):
     _inherit = 'res.partner'
 
     main_nace = fields.Many2one(comodel_name='res.partner.nace',
-                                string="Main activity")
+                                string="Main activity", ondelete='set null')
     secondary_naces = fields.Many2many(comodel_name='res.partner.nace',
-                                       string="Other activities")
+                                       string="Other activities",
+                                       ondelete='set null')
diff --git a/partner_nace/models/res_partner_nace.py b/partner_nace/models/res_partner_nace.py
index ba3f14084..97fc1a655 100644
--- a/partner_nace/models/res_partner_nace.py
+++ b/partner_nace/models/res_partner_nace.py
@@ -42,7 +42,8 @@ class ResPartnerNace(models.Model):
     limit_content = fields.Text(translate=True, string="Also contents")
     exclusions = fields.Char(string="Excludes")
     # Parent hierarchy
-    parent_id = fields.Many2one(comodel_name='res.partner.nace')
+    parent_id = fields.Many2one(comodel_name='res.partner.nace',
+                                ondelete='restrict')
     children = fields.One2many(comodel_name='res.partner.nace',
                                inverse_name='parent_id')
     parent_left = fields.Integer('Parent Left', select=True)