diff --git a/addons/hr_timesheet_invoice/hr_timesheet_invoice.py b/addons/hr_timesheet_invoice/hr_timesheet_invoice.py
index e889e86ce2e..96e8125a4e2 100644
--- a/addons/hr_timesheet_invoice/hr_timesheet_invoice.py
+++ b/addons/hr_timesheet_invoice/hr_timesheet_invoice.py
@@ -251,6 +251,7 @@ class account_analytic_line(osv.osv):
     def invoice_cost_create(self, cr, uid, ids, data=None, context=None):
         invoice_obj = self.pool.get('account.invoice')
         invoice_line_obj = self.pool.get('account.invoice.line')
+        analytic_line_obj = self.pool.get('account.analytic.line')
         invoices = []
         if context is None:
             context = {}
@@ -299,13 +300,15 @@ class account_analytic_line(osv.osv):
                        analytic_line.to_invoice.id,
                        analytic_line.account_id,
                        analytic_line.journal_id.type)
+                # We want to retrieve the data in the partner language for the invoice creation
+                analytic_line = analytic_line_obj.browse(cr, uid , [line.id for line in analytic_line], context=invoice_context)
                 invoice_lines_grouping.setdefault(key, []).append(analytic_line)
 
             # finally creates the invoice line
             for (product_id, uom, user_id, factor_id, account, journal_type), lines_to_invoice in invoice_lines_grouping.items():
                 curr_invoice_line = self._prepare_cost_invoice_line(cr, uid, last_invoice,
                     product_id, uom, user_id, factor_id, account, lines_to_invoice,
-                    journal_type, data, context=context)
+                    journal_type, data, context=invoice_context)
 
                 invoice_line_obj.create(cr, uid, curr_invoice_line, context=context)
             self.write(cr, uid, [l.id for l in analytic_lines], {'invoice_id': last_invoice}, context=context)