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Customizing SAP
CRM 
You customize the SAP CRM System to enable processes that are implemented by the R/3 ORDERS IDoc Mappings. These processes are specific to an ORDERS IDoc.
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1. Enable the GTIN by executing the following:
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a. Go to the IMG and choose SAP Implementation Guide à Customer Relationship Management à Transactions à Basic Settings à Define Transaction Types.
b. Enable the ENTER GTIN flag in the corresponding Transaction Type.
2. Maintain the Dun and Bradstreet Number in the Business Partnermaster data, since the D-U-N-S Number identifies business partners in the SAP CRM System.