Classes of BDoc Types 
BDoc types used in a mySAP CRM scenario can be classified as follows:
· Synchronization BDoc types (sBDoc types)
A synchronization BDoc type is used to exchange data between the CRM server and mobile clients. Therefore, this BDoc type is processed both in the CRM Server and mobile client.
Synchronization BDoc type was earlier called write BDoc in the client-based BDoc Modeler.
The segments of a sBDoc type are mapped to table(s). The mapping defines the relation between the abstraction and physical database.
· Mobile Application BDoc types
A Mobile Application BDoc type is used by CRM Mobile Applications and is processed in the mobile client. The segments of a Mobile Application BDoc type are mapped to table(s). There are two classes of Mobile Application BDoc types, Read only and Modifiable read.
· Messaging BDoc types (mBDoc types)
A Messaging BDoc type is used by CRM server applications. mBDoc type is mapped to a sBDoc type through adapters that are processed in the CRM server. The segment structure of a mBDoc type is not mapped to database tables. Therefore, a mBDoc type does not contain parameters, joins, and where clauses.
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