from odoo import models, api, fields, _
from odoo.exceptions import AccessError, UserError, ValidationError

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

    qty_outstanding = fields.Float(string='Qty Outstanding', compute='_compute_qty_outstanding')

    def _compute_qty_outstanding(self):
        for line in self:
            qty_received = line.purchase_line_id.qty_received
            qty_billed = line.purchase_line_id.qty_invoiced
            line.qty_outstanding = qty_received - qty_billed

    @api.onchange('quantity')
    def _onchange_quantity(self):
        for line in self:
            if line.move_id.move_type == 'in_invoice':
                if line and line.quantity > line.qty_outstanding:
                    raise UserError(_("Quantity Tidak Boleh Melebihi Qty Outstanding"))