RDS for SAP data migration through IDOC's

Dear Experts
Just now we have installed BODS 4.1 and RDS also installed now. I am in the process of exploring the RDS. I found all the migration objects is available in the form of IDOC's. Now my questions are
How to work on custom IDOC's. Do i need to extensively code on R/3 side to upload the custom fields. Like user exit or BADI for custom fileds
If yes then i would say implementation time through RDS will remain more or less same time.
Through BODS or by RDS migration objects is there any way without coding on ABAP R/3 side, Can we achieve migrating custom fields
Please let me how to achieve above requirements by RDS
Thanks
Vijay Mukunthan

Hi Vijay,
You are right, the standard content of the Rapid Data Migration RDS packages brings the content with the standard IDoc interface for SAP standard only. So custom objects are not pre-built with the package. However, we incorporated the foundation to include custom coding as easy as possible:
1) IDoc
We are using the standard interface technology IDoc. IDocs do have an enhancement concept which is described in the online help. There are three main cases and all of them are supported, however two need additional coding:
Z-fields: Additional fields in existing tables lead to IDoc segment extensions
With the IDoc segment versioning concept this is easy to realize without any ABAP coding
Z-tables: Additional IDoc segments will be necessary and lead to a new IDoc version
With the IDoc versioning concept you can easily add Z-segments with leveraging provided user exits
Custom business objects:
You can even create a complete own IDoc message type in Z-namespace for own stuff, leveraging the given ALE layer of the IDoc middleware
2) Enhancement guide
With the RDS package we offer an enhancement guide which helps you to modify the jobs and data flows in the SAP Data Services content according to the changes in the target IDoc structure to reflect additional fields and tables. We built it as a step-by-step guide following for a sample IDoc type but will work similarly for any IDoc.
Best regards,
Frank Densborn.

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