diff --git a/addons/account/account_bank_statement.py b/addons/account/account_bank_statement.py
index 662fdda69d5..53c08525a6a 100644
--- a/addons/account/account_bank_statement.py
+++ b/addons/account/account_bank_statement.py
@@ -730,7 +730,7 @@ class account_bank_statement_line(osv.osv):
         'reconcile_amount': fields.function(_reconcile_amount,
             string='Amount reconciled', method=True, type='float'),
         'sequence': fields.integer('Sequence', help="Gives the sequence order when displaying a list of bank statement lines."),
-        'company_id': fields.related('statement_id', 'company_id', type='many2one', relation='res.company', string='Company', store=True),
+        'company_id': fields.related('statement_id', 'company_id', type='many2one', relation='res.company', string='Company', store=True, readonly=True),
     }
     _defaults = {
         'name': lambda self,cr,uid,context={}: self.pool.get('ir.sequence').get(cr, uid, 'account.bank.statement.line'),