account_invoice_xrechnung/invoice.py

# -*- coding: utf-8 -*-
# This file is part of the cashbook-module from m-ds for Tryton.
# The COPYRIGHT file at the top level of this repository contains the
# full copyright notices and license terms.

from trytond.pool import PoolMeta
from trytond.pyson import Eval, And, Or


class InvoiceLine(metaclass=PoolMeta):
    __name__ = 'account.invoice.line'

    @classmethod
    def __setup__(cls):
        super(InvoiceLine, cls).__setup__()
        cls.unit.states['required'] = Or(
            cls.unit.states['required'],
            And(
                Eval('type') == 'line',
                Eval('quantity', None) != None,
                ),
            )
        cls.unit.depends.add('type')
        cls.unit.depends.add('quantity')

# end Invoice