diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index 405aa7d1443..d3097673d9b 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -161,10 +161,10 @@ class Project(models.Model):
     partner_id = fields.Many2one('res.partner', string='Customer', auto_join=True, tracking=True, domain="['|', ('company_id', '=', False), ('company_id', '=', company_id)]")
     partner_email = fields.Char(
         compute='_compute_partner_email', inverse='_inverse_partner_email',
-        string='Email', readonly=False, store=True)
+        string='Email', readonly=False, store=True, copy=False)
     partner_phone = fields.Char(
         compute='_compute_partner_phone', inverse='_inverse_partner_phone',
-        string="Phone", readonly=False, store=True)
+        string="Phone", readonly=False, store=True, copy=False)
     company_id = fields.Many2one('res.company', string='Company', required=True, default=lambda self: self.env.company)
     currency_id = fields.Many2one('res.currency', related="company_id.currency_id", string="Currency", readonly=True)
     analytic_account_id = fields.Many2one('account.analytic.account', string="Analytic Account", copy=False, ondelete='set null',
@@ -612,10 +612,10 @@ class Task(models.Model):
     commercial_partner_id = fields.Many2one(related='partner_id.commercial_partner_id')
     partner_email = fields.Char(
         compute='_compute_partner_email', inverse='_inverse_partner_email',
-        string='Email', readonly=False, store=True)
+        string='Email', readonly=False, store=True, copy=False)
     partner_phone = fields.Char(
         compute='_compute_partner_phone', inverse='_inverse_partner_phone',
-        string="Phone", readonly=False, store=True)
+        string="Phone", readonly=False, store=True, copy=False)
     ribbon_message = fields.Char('Ribbon Message', compute='_compute_ribbon_message')
     partner_city = fields.Char(related='partner_id.city', readonly=False)
     manager_id = fields.Many2one('res.users', string='Project Manager', related='project_id.user_id', readonly=True)