pos/pos_stock_picking_invoice_link/models/stock_move.py

# Copyright 2019 Tecnativa - David Vidal
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
from odoo import api, fields, models


class StockMove(models.Model):
    _inherit = 'stock.move'

    pos_order_line_id = fields.Many2one(
        comodel_name='pos.order.line',
        string='Related POS Order Line',
    )

    @api.model
    def create(self, vals):
        """We're creating the move in pos.order context
           so we search the line uid"""
        if self.env.context.get('merge_pos_order_line'):
            line = self.env['pos.order.line'].search([
                ('name', '=', vals.get('name')),
            ])
            if line:
                vals['pos_order_line_id'] = line.id
        return super().create(vals)

    @api.model
    def _prepare_merge_moves_distinct_fields(self):
        distinct_fields = super()._prepare_merge_moves_distinct_fields()
        distinct_fields.append('pos_order_line_id')
        return distinct_fields