update_qty_done.py

# -- coding: utf-8 --
from odoo import models, api


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

    def _update_qty_done(self, qty_done, product_id=None, move_line_ids=None, location_id=None, location_dest_id=None lot_id=None, package_id=None, owner_id=None, has_existence=True):
        self.ensure_one()

        if not product_id:
            product_id = self.product_id

        if not location_id:
            location_id = self.location_id

        if not location_dest_id:
            location_dest_id = self.location_dest_id.get_putaway_strategy(product_id).id or self.location_dest_id.id

        if not move_line_ids:
            move_line_ids = self.move_line_ids

        # Si el movimiento no tiene lineas de movimiento,
        # creamos la linea de movimiento.
        if not move_line_ids:
            self.write({'move_line_ids':
                            [(0, 0,
                              {'qty_done': qty_done,
                               'product_id': product_id.id,
                               'location_id': location_id.id,
                               'location_dest_id': location_dest_id.id,
                               'product_uom_id': product_id.uom_id.id,
                               })]
                        })
            return self.move_line_ids, self.quantity_done

        self.write({'move_line_ids':
                        [(1, move_line_ids[0].id,
                          {'qty_done': qty_done}
                          )]
                    })
        return self.move_line_ids, self.quantity_done