Processing in R/3 Shipping makes it possible to carry out all shipping activities without an active connection to a central sales system. As with the R/3 WM system, this permits processing of shipping activities even when the host system is not available.
Bi-directional Process

Analyzing Communication Documents Received in Shipping
Procedures used to evaluate and process communication documents and errors which result from using the Shipping component are exactly the same as for WM.
For a complete description of these procedures, see
The Analysis Tool.