巴西客户要求我在INVOICE中加内容

各位朋友, 现有一事,情况如下: 2013年2月,有出一票货给巴西客户,客户货早已到,此客户所采购的产品为飞机上的零部件,现想扩展更多的业务,要求我们配合,在invoice中注明以下的内容,因为我是第一次碰到这样的情况,不知道是否有什么陷阱,忘各位帮忙分析分析: certificate of conformance: it is hereby certified that all materials used in the quantity called for on the subject sales order conform to the material and/or manufacturing specifications.we guarantee the parts on form,fit and function. returns:all claims for error,shortage or damage must be made within 7 days after receipt of goods.parts must be returned within 15 days.our liability is limited to repair and/or replacement of the parts shipped.and authorized r.m.a number must be accompany all returned goods. 盼复! season ke