account-financial-tools/account_move_line_purchase_info/models/account_move.py

# Copyright 2019 ForgeFlow S.L.
#   (https://www.forgeflow.com)
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

from odoo import fields, models


class AccountMoveLine(models.Model):
    _inherit = "account.move.line"

    purchase_order_id = fields.Many2one(
        comodel_name="purchase.order",
        store=True,
        index=True,
    )