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Entering the Fields in CRM Server 
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1. Add the field/segment to the CRM table.
2. Modify the corresponding messaging BDoc type.
3. Add the field/segment to the CDB table.
4. Modify the corresponding synchronization BDoc type.
5. In the CRM server, an appropriate subscreen or programming logic must be implemented and then populate this data in the newly added fields of the messaging BDoc type.
6. Add code to map the fields by using the user exits.

If you need to enter the field in the mobile client, you must map user exits during:
i. Upload of information from the mobile client to CRM.
ii. Download of information from CRM to CDB.
7. Generate table scripts and metadata. For more information, see Generating Metadata for Business Document Types and Generating Table Scripts.