diff --git a/__init__.py b/__init__.py
index 580cdc9..34788f5 100644
--- a/__init__.py
+++ b/__init__.py
@@ -7,6 +7,7 @@ from .sale import *
 from .statement import *
 from .user import *
 
+
 def register():
     Pool.register(
         Journal,
diff --git a/tests/scenario_sale_payment.rst b/tests/scenario_sale_payment.rst
new file mode 100644
index 0000000..e7bee16
--- /dev/null
+++ b/tests/scenario_sale_payment.rst
@@ -0,0 +1,385 @@
+=====================
+Sale Payment Scenario
+=====================
+
+Imports::
+
+    >>> import datetime
+    >>> from dateutil.relativedelta import relativedelta
+    >>> from decimal import Decimal
+    >>> from operator import attrgetter
+    >>> from proteus import config, Model, Wizard
+    >>> today = datetime.date.today()
+
+Create database::
+
+    >>> config = config.set_trytond()
+    >>> config.pool.test = True
+
+Install sale::
+
+    >>> Module = Model.get('ir.module.module')
+    >>> module, = Module.find([('name', '=', 'sale_payment')])
+    >>> module.click('install')
+    >>> Wizard('ir.module.module.install_upgrade').execute('upgrade')
+
+Create company::
+
+    >>> Currency = Model.get('currency.currency')
+    >>> CurrencyRate = Model.get('currency.currency.rate')
+    >>> currencies = Currency.find([('code', '=', 'USD')])
+    >>> if not currencies:
+    ...     currency = Currency(name='U.S. Dollar', symbol='$', code='USD',
+    ...         rounding=Decimal('0.01'), mon_grouping='[3, 3, 0]',
+    ...         mon_decimal_point='.', mon_thousands_sep=',')
+    ...     currency.save()
+    ...     CurrencyRate(date=today + relativedelta(month=1, day=1),
+    ...         rate=Decimal('1.0'), currency=currency).save()
+    ... else:
+    ...     currency, = currencies
+    >>> Company = Model.get('company.company')
+    >>> Party = Model.get('party.party')
+    >>> company_config = Wizard('company.company.config')
+    >>> company_config.execute('company')
+    >>> company = company_config.form
+    >>> party = Party(name='Dunder Mifflin')
+    >>> party.save()
+    >>> company.party = party
+    >>> company.currency = currency
+    >>> company_config.execute('add')
+    >>> company, = Company.find([])
+
+Reload the context::
+
+    >>> User = Model.get('res.user')
+    >>> Group = Model.get('res.group')
+    >>> config._context = User.get_preferences(True, config.context)
+
+Create fiscal year::
+
+    >>> FiscalYear = Model.get('account.fiscalyear')
+    >>> Sequence = Model.get('ir.sequence')
+    >>> SequenceStrict = Model.get('ir.sequence.strict')
+    >>> fiscalyear = FiscalYear(name=str(today.year))
+    >>> fiscalyear.start_date = today + relativedelta(month=1, day=1)
+    >>> fiscalyear.end_date = today + relativedelta(month=12, day=31)
+    >>> fiscalyear.company = company
+    >>> post_move_seq = Sequence(name=str(today.year), code='account.move',
+    ...     company=company)
+    >>> post_move_seq.save()
+    >>> fiscalyear.post_move_sequence = post_move_seq
+    >>> invoice_seq = SequenceStrict(name=str(today.year),
+    ...     code='account.invoice', company=company)
+    >>> invoice_seq.save()
+    >>> fiscalyear.out_invoice_sequence = invoice_seq
+    >>> fiscalyear.in_invoice_sequence = invoice_seq
+    >>> fiscalyear.out_credit_note_sequence = invoice_seq
+    >>> fiscalyear.in_credit_note_sequence = invoice_seq
+    >>> fiscalyear.save()
+    >>> FiscalYear.create_period([fiscalyear.id], config.context)
+
+Create chart of accounts::
+
+    >>> AccountTemplate = Model.get('account.account.template')
+    >>> Account = Model.get('account.account')
+    >>> Journal = Model.get('account.journal')
+    >>> account_template, = AccountTemplate.find([('parent', '=', None)])
+    >>> create_chart = Wizard('account.create_chart')
+    >>> create_chart.execute('account')
+    >>> create_chart.form.account_template = account_template
+    >>> create_chart.form.company = company
+    >>> create_chart.execute('create_account')
+    >>> receivable, = Account.find([
+    ...         ('kind', '=', 'receivable'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> payable, = Account.find([
+    ...         ('kind', '=', 'payable'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> revenue, = Account.find([
+    ...         ('kind', '=', 'revenue'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> expense, = Account.find([
+    ...         ('kind', '=', 'expense'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> create_chart.form.account_receivable = receivable
+    >>> create_chart.form.account_payable = payable
+    >>> create_chart.execute('create_properties')
+    >>> cash, = Account.find([
+    ...     ('name', '=', 'Main Cash'),
+    ...     ('company', '=', company.id),
+    ... ])
+    >>> account_tax, = Account.find([
+    ...         ('kind', '=', 'other'),
+    ...         ('company', '=', company.id),
+    ...         ('name', '=', 'Main Tax'),
+    ...         ])
+
+Create tax::
+
+    >>> TaxCode = Model.get('account.tax.code')
+    >>> Tax = Model.get('account.tax')
+    >>> tax = Tax()
+    >>> tax.name = 'Tax'
+    >>> tax.description = 'Tax'
+    >>> tax.type = 'percentage'
+    >>> tax.rate = Decimal('.10')
+    >>> tax.invoice_account = account_tax
+    >>> tax.credit_note_account = account_tax
+    >>> invoice_base_code = TaxCode(name='invoice base')
+    >>> invoice_base_code.save()
+    >>> tax.invoice_base_code = invoice_base_code
+    >>> invoice_tax_code = TaxCode(name='invoice tax')
+    >>> invoice_tax_code.save()
+    >>> tax.invoice_tax_code = invoice_tax_code
+    >>> credit_note_base_code = TaxCode(name='credit note base')
+    >>> credit_note_base_code.save()
+    >>> tax.credit_note_base_code = credit_note_base_code
+    >>> credit_note_tax_code = TaxCode(name='credit note tax')
+    >>> credit_note_tax_code.save()
+    >>> tax.credit_note_tax_code = credit_note_tax_code
+    >>> tax.save()
+
+Create parties::
+
+    >>> Party = Model.get('party.party')
+    >>> customer = Party(name='Customer')
+    >>> customer.save()
+
+Create category::
+
+    >>> ProductCategory = Model.get('product.category')
+    >>> category = ProductCategory(name='Category')
+    >>> category.save()
+
+Create product::
+
+    >>> ProductUom = Model.get('product.uom')
+    >>> unit, = ProductUom.find([('name', '=', 'Unit')])
+    >>> ProductTemplate = Model.get('product.template')
+    >>> Product = Model.get('product.product')
+    >>> product = Product()
+    >>> template = ProductTemplate()
+    >>> template.name = 'product'
+    >>> template.category = category
+    >>> template.default_uom = unit
+    >>> template.type = 'service'
+    >>> template.purchasable = True
+    >>> template.salable = True
+    >>> template.list_price = Decimal('10')
+    >>> template.cost_price = Decimal('5')
+    >>> template.cost_price_method = 'fixed'
+    >>> template.account_expense = expense
+    >>> template.account_revenue = revenue
+    >>> template.customer_taxes.append(tax)
+    >>> template.save()
+    >>> product.template = template
+    >>> product.save()
+
+Create payment term::
+
+    >>> PaymentTerm = Model.get('account.invoice.payment_term')
+    >>> PaymentTermLine = Model.get('account.invoice.payment_term.line')
+    >>> payment_term = PaymentTerm(name='Direct')
+    >>> payment_term_line = PaymentTermLine(type='remainder', days=0)
+    >>> payment_term.lines.append(payment_term_line)
+    >>> payment_term.save()
+
+Create a shop::
+
+    >>> Shop = Model.get('sale.shop')
+    >>> PriceList = Model.get('product.price_list')
+    >>> Location = Model.get('stock.location')
+    >>> warehouse, = Location.find([
+    ...         ('code', '=', 'WH'),
+    ...         ])
+    >>> price_list = PriceList()
+    >>> price_list.name = 'Default price list'
+    >>> price_list.save()
+    >>> shop = Shop()
+    >>> shop.name = 'Local shop'
+    >>> shop.warehouse = warehouse
+    >>> shop.shipment_method = 'order'
+    >>> shop.invoice_method = 'order'
+    >>> sequence, = Sequence.find([('code', '=', 'sale.sale')])
+    >>> shop.sale_sequence = sequence
+    >>> shop.payment_term = payment_term
+    >>> shop.price_list = price_list
+    >>> shop.save()
+
+Create journals::
+
+    >>> StatementJournal = Model.get('account.statement.journal')
+    >>> sequence = Sequence(name='Satement',
+    ...     code='account.journal',
+    ...     company=company,
+    ... )
+    >>> sequence.save()
+    >>> account_journal = Journal(name='Statement',
+    ...     type='statement',
+    ...     credit_account=cash,
+    ...     debit_account=cash,
+    ...     sequence=sequence,
+    ... )
+    >>> account_journal.save()
+    >>> statement_journal = StatementJournal(name='Default',
+    ...     journal=account_journal,
+    ...     validation='balance',
+    ... )
+    >>> statement_journal.save()
+
+Create a device::
+
+    >>> Device = Model.get('sale.device')
+    >>> device = Device()
+    >>> device.shop = shop
+    >>> device.name = 'Default'
+    >>> device.journals.append(statement_journal)
+    >>> device.journal = statement_journal
+    >>> device.save()
+
+Reload the context::
+
+    >>> User = Model.get('res.user')
+    >>> Group = Model.get('res.group')
+    >>> user, = User.find([('login', '=', 'admin')])
+    >>> user.shops.append(shop)
+    >>> user.shop = shop
+    >>> user.sale_device = device
+    >>> user.save()
+    >>> config._context = User.get_preferences(True, config.context)
+
+Create sale user::
+
+    >>> shop = Shop(shop.id)
+    >>> sale_user = User()
+    >>> sale_user.name = 'Sale'
+    >>> sale_user.login = 'sale'
+    >>> sale_user.main_company = company
+    >>> sale_group, = Group.find([('name', '=', 'Sales')])
+    >>> sale_user.groups.append(sale_group)
+    >>> sale_user.shops.append(shop)
+    >>> sale_user.shop = shop
+    >>> sale_user.sale_device = device
+    >>> sale_user.save()
+
+Create account user::
+
+    >>> shop = Shop(shop.id)
+    >>> account_user = User()
+    >>> account_user.name = 'Account'
+    >>> account_user.login = 'account'
+    >>> account_user.main_company = company
+    >>> account_group, = Group.find([('name', '=', 'Account')])
+    >>> account_user.groups.append(account_group)
+    >>> account_user.shops.append(shop)
+    >>> account_user.shop = shop
+    >>> account_user.sale_device = device
+    >>> account_user.save()
+
+Sale services::
+
+    >>> config.user = sale_user.id
+    >>> Sale = Model.get('sale.sale')
+    >>> SaleLine = Model.get('sale.line')
+    >>> sale = Sale()
+    >>> sale.party = customer
+    >>> sale_line = sale.lines.new()
+    >>> sale_line.product = product
+    >>> sale_line.quantity = 2.0
+    >>> sale.save()
+    >>> len(sale.shipments), len(sale.invoices), len(sale.payments)
+    (0, 0, 0)
+
+Open statements for current device::
+
+    >>> Statement = Model.get('account.statement')
+    >>> len(Statement.find([('state', '=', 'draft')]))
+    0
+    >>> open_statment = Wizard('open.statement')
+    >>> open_statment.execute('create_')
+    >>> open_statment.form.result
+    u'Statement Default opened.\n'
+    >>> payment_statement, = Statement.find([('state', '=', 'draft')])
+
+Partially pay the sale::
+
+    >>> pay_sale = Wizard('sale.payment', [sale])
+    >>> pay_sale.form.journal == statement_journal
+    True
+    >>> pay_sale.form.payment_amount
+    Decimal('22.00')
+    >>> pay_sale.form.payment_amount = Decimal('12.00')
+    >>> pay_sale.execute('pay_')
+    >>> statment_line, = payment_statement.lines
+    >>> statment_line.amount
+    Decimal('12.00')
+    >>> statment_line.party == customer
+    True
+    >>> statment_line.sale == sale
+    True
+    >>> sale.reload()
+    >>> sale.paid_amount
+    Decimal('12.00')
+    >>> sale.residual_amount
+    Decimal('10.00')
+    >>> len(sale.shipments), len(sale.invoices), len(sale.payments)
+    (0, 0, 1)
+
+When the sale is paid invoice is generated::
+
+    >>> pay_sale.form.payment_amount
+    Decimal('10.00')
+    >>> pay_sale.execute('pay_')
+    >>> payment_statement.reload()
+    >>> _, statement_line = payment_statement.lines
+    >>> statement_line.amount
+    Decimal('10.00')
+    >>> statement_line.party == customer
+    True
+    >>> statement_line.sale == sale
+    True
+    >>> sale.reload()
+    >>> sale.paid_amount
+    Decimal('22.00')
+    >>> sale.residual_amount
+    Decimal('0.00')
+    >>> len(sale.shipments), len(sale.invoices), len(sale.payments)
+    (0, 1, 2)
+
+An invoice should be created for the sale::
+
+    >>> invoice, = sale.invoices
+    >>> config.user = account_user.id
+    >>> invoice.state
+    u'posted'
+    >>> invoice.untaxed_amount
+    Decimal('20.00')
+    >>> invoice.tax_amount
+    Decimal('2.00')
+    >>> invoice.total_amount
+    Decimal('22.00')
+
+When the statement is closed the invoices are paid and sale is done::
+
+    >>> close_statment = Wizard('close.statement')
+    >>> close_statment.execute('validate')
+    >>> close_statment.form.result
+    u'Statement Default - Default closed.\n'
+    >>> payment_statement.reload()
+    >>> payment_statement.state
+    u'validated'
+    >>> all(l.invoice == invoice for l in payment_statement.lines)
+    True
+    >>> payment_statement.balance
+    Decimal('22.00')
+    >>> invoice.reload()
+    >>> invoice.state
+    u'paid'
+    >>> config.user = sale_user.id
+    >>> sale.reload()
+    >>> sale.state
+    u'done'
diff --git a/tests/test_sale_payment.py b/tests/test_sale_payment.py
index 79cbc0f..585a72e 100644
--- a/tests/test_sale_payment.py
+++ b/tests/test_sale_payment.py
@@ -3,8 +3,10 @@
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
 import unittest
+import doctest
 import trytond.tests.test_tryton
 from trytond.tests.test_tryton import test_view, test_depends
+from trytond.tests.test_tryton import doctest_setup, doctest_teardown
 
 
 class SalePaymentTestCase(unittest.TestCase):
@@ -26,4 +28,7 @@ def suite():
     suite = trytond.tests.test_tryton.suite()
     suite.addTests(unittest.TestLoader().loadTestsFromTestCase(
         SalePaymentTestCase))
+    suite.addTests(doctest.DocFileSuite('scenario_sale_payment.rst',
+            setUp=doctest_setup, tearDown=doctest_teardown, encoding='utf-8',
+            optionflags=doctest.REPORT_ONLY_FIRST_FAILURE))
     return suite