ROI method 1: Vendor-driven forms comparison using Request for purchase.
ROI方法1：使用采购申请书进行供应商驱动的表单比较。
There are two messages in this Web service, a request for purchase order, and a message that acknowledges the receipt of the request.
这个Web服务有两个消息，一个订购单请求消息，另外一个是请求收到的确认消息。
Your cost of doing this analysis is limited to gathering information in a detailed request for purchase (RFP) and evaluating the total costs in the responses.
进行这种分析的成本仅限于将信息搜集到详细的采购申请书(RFP)中和计算回响应中的总成本。
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