Overview of IDocs
Several hundred IDocs are shipped with each SAP R/3 system. ALE and EDI interfaces use functionally equivalent IDocs; however, they differ in the manner in which the IDocs are communicated to or from SAP R/3.
- ALE IDocs are communicated through memory buffers, without intermediate files, directly to or from an RFC port using transactional remote function calls (RFCs).
- EDI IDocs are passed using an intermediate file.
These interfaces (ALE and EDI) that use the IDoc structure represent SAP's strategic approach to interfacing SAP R/3 with legacy and third-party applications where loose coupling is appropriate. Therefore, the SAP R/3 IDoc approach should be considered the first choice for developing interfaces where asynchronous, near-real time, or batch links are required. This pack supports SAP-supplied IDocs as well as user-defined IDocs.
One or more IDocs are held in a container called a packet. A packet is the largest data container in an IDoc schema. The restart attribute is automatically added to reject invalid IDocs contained within a packet.