module invoice description 2.6

from __future__ import with_statement
from trytond.model import Workflow, ModelView, ModelSQL, fields
from trytond.pool import Pool, PoolMeta

__all__ = ['Sale']
__metaclass__ = PoolMeta

class Sale(Workflow, ModelSQL, ModelView):
    'Sale'
    __name__ = 'sale.sale'


    @classmethod
    def create_invoice(self, invoice_type):
        invoice_id = super(Sale, self).create_invoice(sale, invoice_type)
        pool = Pool()
        Invoice = pool.get('account.invoice')
        Sale = pool.get('sale.sale')
        description = Sale.description
        if invoice_id:
            Invoice.write(invoice_id, {'description':description})
        return invoice_id