BDoc
BDoc (Business Document) messages are used in SAP CRM systems as containers for the data that constitute a business process (application message, transaction). BDoc messages are exchanged internally within the CRM Server between the CRM Application and the CRM Middleware, and between the CRM Server and CRM Mobile Clients (Field Applications). SAP ERP does not know the concept of BDocs, so there is no exchange of BDoc messages between an SAP ERP system and SAP CRM. Instead, the business data is packed into containers during BAPI calls. So during a data exchange to and from SAP ERP, there are in fact outbound and inbound BDoc messages on the CRM Server, but only to communicate with the inbound and outbound ERP (R/3) adapters. Externally the content of the BDoc message is mapped to the mentioned BAPI container structure.
To display BDocs in your system you can use transaction SMW01 or SMW02.