diff --git a/addons/analytic/analytic.py b/addons/analytic/analytic.py
index 70a416904f4..7e38ea1347f 100644
--- a/addons/analytic/analytic.py
+++ b/addons/analytic/analytic.py
@@ -183,9 +183,9 @@ class account_analytic_account(osv.osv):
         'template_id': fields.many2one('account.analytic.account', 'Template of Contract'),
         'description': fields.text('Description'),
         'parent_id': fields.many2one('account.analytic.account', 'Parent Analytic Account', select=2),
-        'child_ids': fields.one2many('account.analytic.account', 'parent_id', 'Child Accounts'),
+        'child_ids': fields.one2many('account.analytic.account', 'parent_id', 'Child Accounts', copy=True),
         'child_complete_ids': fields.function(_child_compute, relation='account.analytic.account', string="Account Hierarchy", type='many2many'),
-        'line_ids': fields.one2many('account.analytic.line', 'account_id', 'Analytic Entries'),
+        'line_ids': fields.one2many('account.analytic.line', 'account_id', 'Analytic Entries', copy=False),
         'balance': fields.function(_debit_credit_bal_qtty, type='float', string='Balance', multi='debit_credit_bal_qtty', digits_compute=dp.get_precision('Account')),
         'debit': fields.function(_debit_credit_bal_qtty, type='float', string='Debit', multi='debit_credit_bal_qtty', digits_compute=dp.get_precision('Account')),
         'credit': fields.function(_debit_credit_bal_qtty, type='float', string='Credit', multi='debit_credit_bal_qtty', digits_compute=dp.get_precision('Account')),