contract/product_contract/models/contract_line.py

# Copyright 2017 LasLabs Inc.
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).


from odoo import api, fields, models


class AccountAnalyticInvoiceLine(models.Model):
    _inherit = 'account.analytic.invoice.line'

    sale_order_line_id = fields.Many2one(
        comodel_name="sale.order.line",
        string="Sale Order Line",
        required=False,
        copy=False,
    )

    @api.multi
    def _prepare_invoice_line(self, invoice_id=False):
        res = super(AccountAnalyticInvoiceLine, self)._prepare_invoice_line(
            invoice_id=invoice_id
        )
        if self.sale_order_line_id and res:
            res['sale_line_ids'] = [(6, 0, [self.sale_order_line_id.id])]
        return res