contract/agreement_maintenance/models/agreement.py

# Copyright (C) 2018 - TODAY, Pavlov Media
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

from odoo import fields, models


class Agreement(models.Model):
    _inherit = 'agreement'

    serviceprofile_ids = fields.One2many(
        'agreement.serviceprofile',
        'agreement_id',
        string="Service Profile",
        copy=True
    )