[FIX] hr_payroll_account: onchange_contract

Journal on payslip has to be taken from employee's contract if it is set.

fixes #11188

addons/hr_payroll_account/hr_payroll_account.py

@@ -3,6 +3,7 @@
 import time
 from datetime import date, datetime, timedelta
 
+from openerp import api
 from openerp.osv import fields, osv
 from openerp.tools import float_compare, float_is_zero
 from openerp.tools.translate import _
@@ -70,6 +71,12 @@ class hr_payslip(osv.osv):
         res['value'].update({'journal_id': journal_id})
         return res
 
+    @api.onchange('contract_id')
+    def onchange_contract(self):
+        super(hr_payslip, self).onchange_contract()
+        self.journal_id = self.contract_id and self.contract_id.journal_id.id or (not self.contract_id and self._get_default_journal())
+        return
+
     def cancel_sheet(self, cr, uid, ids, context=None):
         move_pool = self.pool.get('account.move')
         move_ids = []