[FIX] account_voucher: Fixed wrong writeoff(Payment Difference) calculation by recomp...

bzr revid: rgo@tinyerp.com-20140423070139-ielwafap3zcupglx

diff --cc addons/account_voucher/account_voucher.py
Simple merge

diff --cc addons/account_voucher/test/sales_payment.yml
index b71e42a,b71e42a..cdef3cf
--- 1/addons/account_voucher/test/sales_payment.yml
--- 2/addons/account_voucher/test/sales_payment.yml
+++ b/addons/account_voucher/test/sales_payment.yml
@@@ -40,6 -40,6 +40,8 @@@
      import netsvc
      vals = {}
      journal_id = self.default_get(cr, uid, ['journal_id']).get('journal_id',None)
++    voucher = self.recompute_voucher_lines(cr, uid, [], ref("base.res_partner_19"), journal_id, 450.0, ref('base.EUR'), 'receipt', False)
++    assert (voucher['value'].get('writeoff_amount') == 0.0), "Writeoff amount calculated by recompute_voucher_lines() is not 0.0"
      res = self.onchange_partner_id(cr, uid, [], ref("base.res_partner_19"), journal_id, 0.0, 1, ttype='receipt', date=False)
      vals = {
          'account_id': ref('account.cash'),
@@@ -60,6 -60,6 +62,7 @@@
      vals['line_cr_ids'] = [(0,0,i) for i in res['value']['line_cr_ids']]
      id = self.create(cr, uid, vals)
      voucher_id = self.browse(cr, uid, id)
++    assert (voucher_id.writeoff_amount == 0.0), "Writeoff amount is not 0.0"
      assert (voucher_id.state=='draft'), "Voucher is not in draft state"
      wf_service = netsvc.LocalService("workflow")
      wf_service.trg_validate(uid, 'account.voucher', voucher_id.id, 'proforma_voucher', cr)