Если можно, дайте информацию по Idoc (с самого начала), необходимую для программиста.

Ее очень много
Смотри курсы, SAP Library и Interface Repository

Documentation Resources

SAP Library (http://help.sap.com/)

 Basis Components  Middleware (BC-MID)  Application Link Enabling (BC-MID-ALE)
• ALE Introduction and Administration — basic information about ALE
• ALE Programming Guide — information for advanced users and programmers

 Basis Components  Basis Services / Communication Interfaces (BC-SRV)  The IDOC Interface (BC-SRV-EDI)
• IDoc Interface / Electronic Data Interchange — EDI-specific information and valuable chapters about IDocs, including Monitoring
• IDoc Interface: EDI Application Scenarios — descriptions of SAP standard EDI scenarios in logistics, which can be used for ALE as well

 Cross Application Components  Business Framework Architecture (CA-BFA)  ALE Business Process Library (CA-BFA-ABL)
• Library of ALE Business Processes — overview and detailed descriptions of various ALE business processes in Cross Applications, Logistics, Human Resources, Accounting, and Information Systems
• Quick Start — hands-on exercise for ALE distribution of material master
The Quick Start is a must for anyone who just wants to set up a simple ALE distribution scenario but doesn’t want to go into details.

 Implementation Guide
• R/3 Basis Customizing  Application Link Enabling (ALE) — explanations for all IMG activities within transaction SALE
• Cross-Application Components  Predefined ALE Business Processes — settings and background on the CA-BFA-ABL Library of ALE business processes

SAP Service Marketplace (http://service.sap.com/)

Go to the SAP NetWeaver home page in the SAP Service Marketplace (http://service.sap.com/netweaver) and select Application Link Enabling (ALE) and Interface Adviser from the More Technology Topics… dropdown.

 Application Link Enabling (ALE) — Read the general information and download the presentations that interest you.

 Interface Adviser — Browse for ALE technology information and ALE business scenarios.

SAP Professional Journal (http://www.sappro.com/)

 In the Premiere Issue, see the article “Real-Time, Outbound Interfaces to Non-R/3 Systems Made Simple with Change Pointers, Message Control, and Workflow” by Amy Stapleton. This is an inspiring article on how to apply ALE in master data distribution.