from odoo import fields, models

CUSTOMER_MOVE_TYPES = ("out_invoice", "out_refund")


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

    # Core has copy=False. Flipped to True here; copy_data() below limits the
    # effect to customer invoices and credit notes.
    ref = fields.Char(copy=True)

    def copy_data(self, default=None):
        data_list = super().copy_data(default)
        if default and "ref" in default:
            return data_list
        for move, data in zip(self, data_list):
            if move.move_type not in CUSTOMER_MOVE_TYPES:
                data.pop("ref", None)
        return data_list