other minimum changes

__init__.py

@@ -3,14 +3,18 @@
 
 from trytond.pool import Pool
 from . import sale  
+from . import statement
 __all__ = ['register']
 
 
 def register():
     Pool.register(
-        sale.SalePaymentForm,
-        module='sale_payment_form', type_='model')
+            sale.SalePaymentForm,
+            statement.Line,
+            module='sale_payment_form', type_='model')
     Pool.register(
-        module='sale_payment_form', type_='wizard')
+            sale.WizardSalePayment,
+            sale.WizardSaleReconcile,
+            module='sale_payment_form', type_='wizard')
     Pool.register(
-        module='sale_payment_form', type_='report')
+            module='sale_payment_form', type_='report')

sale.py

@@ -13,6 +13,7 @@ from trytond.wizard import Wizard, StateView, StateTransition, Button
 from trytond.i18n import gettext
 from trytond.exceptions import UserError
 
+
 class SalePaymentForm(metaclass=PoolMeta):
     'Sale Payment Form'
     __name__ = 'sale.payment.form'
@@ -63,9 +64,16 @@ class SalePaymentForm(metaclass=PoolMeta):
        if self.payment_amount > amount:
            self.payment_amount  = amount
 
+
 class WizardSalePayment(metaclass=PoolMeta):
     'Wizard Sale Payment'
     __name__ = 'sale.payment'
+    start = StateView('sale.payment.form',
+        'sale_payment.sale_payment_view_form', [
+            Button('Cancel', 'end', 'tryton-cancel'),
+            Button('Pay', 'pay_', 'tryton-ok', default=True),
+        ])
+    pay_ = StateTransition()
 
     def default_start(self, fields):
         pool = Pool()
@@ -80,10 +88,102 @@ class WizardSalePayment(metaclass=PoolMeta):
             'journal': sale_device.journal.id
                 if sale_device.journal else None,
             'journals': [j.id for j in sale_device.journals],
-            'paid_amount': sale.paid_amount,
-            'payment_amount': sale.total_amount - sale.paid_amount,
+            'payment_amount': sale.total_amount - sale.paid_amount
+                if sale.paid_amount else sale.total_amount,
             'currency_digits': sale.currency_digits,
             'party': sale.party.id,
             }
 
+    def get_statement_line(self, sale):
+        pool = Pool()
+        Date = pool.get('ir.date')
+        Sale = pool.get('sale.sale')
+        Statement = pool.get('account.statement')
+        StatementLine = pool.get('account.statement.line')
+
+        form = self.start
+        statements = Statement.search([
+                ('journal', '=', form.journal),
+                ('state', '=', 'draft'),
+                ], order=[('date', 'DESC')])
+        if not statements:
+            raise UserError(gettext('sale_payment.not_draft_statement',
+                journal=form.journal.name))
+
+        if not sale.number:
+            Sale.set_number([sale])
+
+        with Transaction().set_context(date=Date.today()):
+            account = sale.party.account_receivable_used
+
+        if not account:
+            raise UserError(gettext(
+                'sale_payment.party_without_account_receivable',
+                    party=sale.party.name))
+        if form.payment_amount:
+            return StatementLine(
+                statement=statements[0],
+                date=Date.today(),
+                amount=form.payment_amount,
+                party=sale.party,
+                invoice=sale.invoices[0].id,
+                account=account,
+                description=sale.number,
+                sale=sale,
+                )
+
+    def transition_pay_(self):
+        Sale = Pool().get('sale.sale')
+
+        active_id = Transaction().context.get('active_id', False)
+        sale = Sale(active_id)
+
+        line = self.get_statement_line(sale)
+        if line:
+            line.save()
+
+        if sale.total_amount != sale.paid_amount:
+            return 'start'
+        if sale.state != 'draft':
+            return 'end'
+
+        sale.description = sale.reference
+        sale.save()
+        Sale.workflow_to_end([sale])
+
+        return 'end'
+
+
+class WizardSaleReconcile(Wizard):
+    'Reconcile Sales'
+    __name__ = 'sale.reconcile'
+    start = StateTransition()
+    reconcile = StateTransition()
+
+    def transition_start(self):
+        pool = Pool()
+        Sale = pool.get('sale.sale')
+        Line = pool.get('account.move.line')
+        for sale in Sale.browse(Transaction().context['active_ids']):
+            account = sale.party.account_receivable_used
+            lines = []
+            amount = Decimal('0.0')
+            for invoice in sale.invoices:
+                for line in invoice.lines_to_pay:
+                    if not line.reconciliation:
+                        lines.append(line)
+                        amount += line.debit - line.credit
+            for payment in sale.payments:
+                if not payment.move:
+                    continue
+                for line in payment.move.lines:
+                    if (not line.reconciliation and
+                            line.account.id == account.id):
+                        lines.append(line)
+                        amount += line.debit - line.credit
+            if lines and amount == Decimal('0.0'):
+                Line.reconcile(lines)
+        return 'end'
+
+
 

statement.py

@@ -0,0 +1,74 @@
+# This file is part of the sale_payment module for Tryton.
+# The COPYRIGHT file at the top level of this repository contains the full
+# copyright notices and license terms.
+from trytond.model import fields
+from trytond.pool import Pool, PoolMeta
+from decimal import Decimal
+from trytond.i18n import gettext
+from trytond.exceptions import UserError
+
+__all__ = ['Line']
+
+
+class Line(metaclass=PoolMeta):
+    __name__ = 'account.statement.line'
+    sale = fields.Many2One('sale.sale', 'Sale', ondelete='RESTRICT')
+    unblocked = fields.Boolean('unblocked', 'Unblocked', select=False)
+
+    @classmethod
+    def delete(cls, lines):
+        for line in lines:
+            if line.unblocked == False:
+                raise UserError(str(line.unblocked))
+        super(Line, cls).delete(lines)
+
+    def create_move(self):
+        '''
+        Create move for the statement line and return move if created.
+        Redefined method to allow amounts in statement lines greater than the
+        invoice amount.
+        '''
+        pool = Pool()
+        Move = pool.get('account.move')
+        Period = pool.get('account.period')
+        Invoice = pool.get('account.invoice')
+        Currency = pool.get('currency.currency')
+        MoveLine = pool.get('account.move.line')
+
+        if self.move:
+            return
+
+        period_id = Period.find(self.statement.company.id, date=self.date)
+
+        move_lines = self._get_move_lines()
+        move = Move(
+            period=period_id,
+            journal=self.statement.journal.journal,
+            date=self.date,
+            origin=self,
+            lines=move_lines,
+            )
+        move.save()
+
+        self.write([self], {
+                'move': move.id,
+                })
+
+        if self.invoice:
+            with Transaction().set_context(date=self.invoice.currency_date):
+                amount = Currency.compute(self.statement.journal.currency,
+                    self.amount, self.statement.company.currency)
+
+            reconcile_lines = self.invoice.get_reconcile_lines_for_amount(
+                abs(amount))
+
+            for move_line in move.lines:
+                if move_line.account == self.invoice.account:
+                    Invoice.write([self.invoice], {
+                            'payment_lines': [('add', [move_line.id])],
+                            })
+                    break
+            if reconcile_lines[1] == Decimal('0.0'):
+                lines = reconcile_lines[0] + [move_line]
+                MoveLine.reconcile(lines)
+        return move

statement.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!-- This file is part of the sale_payment module for Tryton.
+The COPYRIGHT file at the top level of this repository contains the full
+copyright notices and license terms. -->
+<tryton>
+    <data>
+        <record model="ir.ui.view" id="statement_line_view_form">
+            <field name="model">account.statement.line</field>
+	    <field name="inherit" ref="account_statement.statement_line_view_form"/>
+	    <field name="name">statement_line_form</field>
+        </record>
+    </data>
+</tryton>

tryton.cfg

@@ -7,3 +7,4 @@ depends:
     sale_payment
 xml:
     sale.xml
+    statement.xml

view/statement_line_form.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<!-- This file is part of account_payment_type module for Tryton.
+The COPYRIGHT file at the top level of this repository contains the full
+copyright notices and license types. -->
+<data>
+	<xpath expr="//field[@name='date']" position="after">
+		<label name="unblocked"/>
+		<field name="unblocked"/>
+	</xpath>
+</data>