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  In order to check the Account_voucher module with multi-currency in OpenERP,
  I create an invoice in CAD and make its Payment in CHF based on the currency rating on that particular date.
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  I set the income and expense currency accounts on the main company
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  !python {model: res.company}: |
    from datetime import datetime
    vals = {
      'income_currency_exchange_account_id': ref('account.o_expense'),
      'expense_currency_exchange_account_id': ref('account.o_expense')}
    self.write(cr, uid, ref('base.main_company'), vals)
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  I create currency CAD in OpenERP for January of 1.338800 Rate
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  !record {model: res.currency.rate, id: jan_cad}:
    currency_id: base.CAD
    name: !eval "'%s-01-01' %(datetime.now().year)"
    rate: 1.338800
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  I create currency CAD in OpenERP for March of 2.000000 Rate
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  !record {model: res.currency.rate, id: mar_cad}:
    currency_id: base.CAD
    name: !eval "'%s-03-01' %(datetime.now().year)"
    rate: 2.000000
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  I create currency CHF in OpenERP for January of 1.308600 Rate
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  !record {model: res.currency.rate, id: jan_chf}:
    currency_id: base.CHF
    name: !eval "'%s-01-01' %(datetime.now().year)"
    rate: 1.308600
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  I create currency CHF in OpenERP for March of 1.250000 Rate
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  !record {model: res.currency.rate, id: mar_chf}:
    currency_id: base.CHF
    name: !eval "'%s-03-01' %(datetime.now().year)"
    rate: 1.25000
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  I create a cash account with currency CHF
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  !record {model: account.account, id: account_cash_chf_id}:
    currency_id: base.CHF
    name: "cash account in chf"
    code: "Xcash chf"
    type: 'liquidity'
    user_type: "account.data_account_type_cash"

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  I create a bank journal with CHF as currency
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  !record {model: account.journal, id: bank_journal_CHF}:
    name: Bank Journal(CHF)
    code: BCHF
    type: bank
    analytic_journal_id: account.sit
    sequence_id: account.sequence_bank_journal
    default_debit_account_id: account_cash_chf_id
    default_credit_account_id: account_cash_chf_id
    currency: base.CHF
    company_id: base.main_company
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  I create the first invoice on 1st January for 200 CAD
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  !record {model: account.invoice, id: account_first_invoice_jan_cad}:
    account_id: account.a_recv
    company_id: base.main_company
    currency_id: base.CAD
    date_invoice: !eval "'%s-01-01' %(datetime.now().year)"
    period_id: account.period_1
    invoice_line:
      - account_id: account.a_sale
        name: '[PCSC234] PC Assemble SC234'
        price_unit: 200.0
        quantity: 1.0
        product_id: product.product_product_3
        uos_id: product.product_uom_unit
    journal_id: account.sales_journal
    partner_id: base.res_partner_19
    reference_type: none
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  I Validate invoice by clicking on Validate button
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  !workflow {model: account.invoice, action: invoice_open, ref: account_first_invoice_jan_cad}
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  I check that first invoice move is correct for debtor account (debit - credit == 149.39)
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  !python {model: account.invoice}: |
    from openerp.tools import float_compare
    invoice_id = self.browse(cr, uid, ref("account_first_invoice_jan_cad"))
    assert invoice_id.move_id, "Move not created for open invoice"
    move_line_obj = self.pool.get('account.move.line')
    move_lines = move_line_obj.search(cr, uid, [('move_id', '=', invoice_id.move_id.id), ('account_id', '=', invoice_id.account_id.id)])
    move_line = move_line_obj.browse(cr, uid, move_lines[0])
    assert float_compare(move_line.debit - move_line.credit, 149.39, 2) == 0, "Invoice move is incorrect for debtors account"
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  I set the context that will be used for the encoding of all the vouchers of this file
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  !context
    'type': 'receipt'
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  I create the first voucher of payment with values 200 CHF, journal CHF
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  !record {model: account.voucher, id: account_voucher_1_case4, view: view_vendor_receipt_form}:
    account_id: account.cash
    amount: 200
    company_id: base.main_company
    journal_id: bank_journal_CHF
    partner_id: base.res_partner_19
    period_id: account.period_3
    date: !eval time.strftime("%Y-03-01")
    payment_option: 'with_writeoff'
    writeoff_acc_id: account.a_expense
    comment: 'Write Off'
    name: 'First payment: Case 4'
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  I completly pay the invoice of 200 CAD
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  !python {model: account.voucher}: |
    import time
    from openerp import netsvc
    vals = {}
    voucher_id = self.browse(cr, uid, ref('account_voucher_1_case4'))
    data = []
    for item in voucher_id.line_cr_ids:
        if item.amount_unreconciled == 186.74:
            data += [(item.id, 186.74)]
        else:
            data += [(item.id, 0.0)]
    for line_id, amount in data:
        self.pool.get('account.voucher.line').write(cr, uid, [line_id], {'amount': amount})
    assert (voucher_id.state=='draft'), "Voucher is not in draft state"
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  I check that writeoff amount computed is 13.26
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  !python {model: account.voucher}: |
    voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 4'), ('partner_id', '=', ref('base.res_partner_19'))])
    voucher_id = self.browse(cr, uid, voucher[0])
    assert (round(voucher_id.writeoff_amount,2) == 13.26), "Writeoff amount is not 13.26 CHF"
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  I confirm the voucher
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  !python {model: account.voucher}: |
    voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 4'), ('partner_id', '=', ref('base.res_partner_19'))])
    self.signal_workflow(cr, uid, voucher, 'proforma_voucher')

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  I check that the move of my voucher is valid
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  !python {model: account.voucher}: |
    voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 4'), ('partner_id', '=', ref('base.res_partner_19'))])
    voucher_id = self.browse(cr, uid, voucher[0])
    move_line_obj = self.pool.get('account.move.line')
    move_lines = move_line_obj.search(cr, uid, [('move_id', '=', voucher_id.move_id.id)])
    for move_line in move_line_obj.browse(cr, uid, move_lines):
        assert move_line.state == 'valid', "Voucher move is not valid"
    assert voucher_id.state == 'posted', "Voucher state is not posted"
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  I check that my debtor account is correct
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  I check that the debtor account has 1 new line with -298.78 as amount_currency columns and 149.39 of credit and currency is CAD.
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  I check that my currency rate difference is correct. 0 in debit with 98.78 CAD as amount_currency
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  I check that my writeoff is correct. 11.05 credit and -13.26 amount_currency
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  !python {model: account.voucher}: |
    from openerp.tools import float_compare
    voucher = self.search(cr, uid, [('name', '=', 'First payment: Case 4'), ('partner_id', '=', ref('base.res_partner_19'))])
    voucher_id = self.browse(cr, uid, voucher[0])
    move_line_obj = self.pool.get('account.move.line')
    move_lines = move_line_obj.search(cr, uid, [('move_id', '=', voucher_id.move_id.id)])
    assert move_lines, "Voucher move has no lines"
    for move_line in move_line_obj.browse(cr, uid, move_lines):
        if float_compare(move_line.amount_currency, 200, 2) == 0:
            assert float_compare(move_line.debit, 160.00, 2) == 0, "Bank account has wrong entry."
        elif float_compare(move_line.amount_currency, -298.78, 2) == 0:
            assert float_compare(move_line.credit, 149.39, 2) == 0, "Debtor account has wrong entry."
        elif move_line.debit == 0.00 and move_line.credit == 0.00:
            assert move_line.amount_currency == 98.78, "Incorrect Currency Difference, got %s as amount_currency (expected 98.78)." % (move_line.amount_currency)
            assert move_line.currency_id.id == ref('base.CAD'), "Incorrect Currency Difference, got %s (expected 'CAD')" % (move_line.currency_id.name)
        elif move_line.credit == 10.61:
            assert move_line.amount_currency == -13.26, "Writeoff amount is wrong."
        else:
            assert False, "Wrong entry"
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  I check the residual amount of Invoice1, should be 0 in residual currency and 0 in amount_residual and paid
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  !python {model: account.invoice}: |
    invoice_id = self.browse(cr, uid, ref("account_first_invoice_jan_cad"))
    move_line_obj = self.pool.get('account.move.line')
    move_lines = move_line_obj.search(cr, uid, [('move_id', '=', invoice_id.move_id.id), ('invoice', '=', invoice_id.id), ('account_id', '=', invoice_id.account_id.id)])
    move_line = move_line_obj.browse(cr, uid, move_lines[0])
    assert (move_line.amount_residual_currency == 0.0 and move_line.amount_residual == 0.0 and invoice_id.state == 'paid') , "Residual amount is not correct for first Invoice"