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

class jikimo_purchase_tier_validation(models.Model):
    _name = 'purchase.order'
    _inherit = ['purchase.order', 'tier.validation']

    def request_validation(self):
        for record in self:
            missing_fields = []
            if not record.partner_ref:
                missing_fields.append('合同名称')
            if not record.contract_number:
                missing_fields.append('合同编号')
            
            if missing_fields:
                raise ValidationError(_('如下字段要求必须填写：%s') % '、'.join(missing_fields))
                
        return super(jikimo_purchase_tier_validation, self).request_validation()