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Customer Purchase
Order Number 
You use this to map the customer purchase order number from the incoming IDoc to the external reference number of the sales order in the SAP CRM System. The information regarding the documents is stored as part of a sales transaction.
· This external reference identifies the respective order in the external system. The segment E1EDK02 contains information related to the customer purchase order number and purchase order date.
· The order number and date created, is mapped to the sales data segment of the Complex Data Type for the business transaction.