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Message 
A message is an encapsulation of all business data that is necessary to run a business process. Data is transferred from the mobile client to the CRM server in the form of BDoc messages.
A message contains:
· A message header:- A message must have a message header segment that contains the message ID or transaction ID. This ID uniquely identifies all messages. The message header also includes information about the message type. This defines the techniques of processing a message. All messages contain a generic header called MESSAGE_HEADER.
· Message Body:- The message body contains Task, SendBits, system ID besides segments and the site ID.
· Error segment:- This is optional.
