一、检查企业的运费发票企业的运费发票按照规定都要填写产品的起运地和到达地，结合企业开具的产品销货发票，认真核对产品到达地是否都有相应的发票开出，假如没有，则企业可能存在账外经营行为。二、检查企业“原材料”、“生产成本”、“产成品”等账户，分析它们之间的勾? First, check the freight company invoice In accordance with the provisions must fill in the product to the place of departure and arrival, combined with the company issued a product sales invoice, carefully check whether the product arrived at the corresponding invoice out, if not, The company may have non-operating activities. Second, check the business “raw materials”, “production costs”, “finished products” and other accounts, analyze the hook between them?