How To Fix E0779 - Names of segment types of the predecessor IDoc type cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 779

• Message text: Names of segment types of the predecessor IDoc type cannot be changed

What causes this issue?

The name of the segment type is already defined in the predecessor
&v1&. It can therefore not be changed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E0779 - Names of segment types of the predecessor IDoc type cannot be changed ?

  The SAP error message E0779, which states "Names of segment types of the predecessor IDoc type cannot be changed," typically occurs when there is an attempt to modify the segment types of an IDoc type that has already been defined and is in use. This error is related to the IDoc (Intermediate Document) structure in SAP, which is used for data interchange between SAP systems and external systems.
  Cause:
  
  Modification of Existing IDoc Type: The error arises when you try to change the names of segment types in an IDoc type that has already been created and possibly used in transactions or processes.
  Predecessor IDoc Type: If the IDoc type you are trying to modify is based on a predecessor IDoc type, the system restricts changes to ensure data integrity and consistency.
  Dependencies: There may be existing dependencies, such as mappings or configurations, that rely on the original segment names.
  
  Solution:
  
  Create a New IDoc Type: Instead of modifying the existing IDoc type, create a new IDoc type with the desired segment names. This is the recommended approach to avoid conflicts and maintain data integrity.
  Use the Existing IDoc Type: If the changes are not critical, consider using the existing IDoc type as is, and adjust your processes to accommodate the current structure.
  Check Dependencies: Before making any changes, check for any dependencies or references to the IDoc type in other configurations, such as message types, partner profiles, or mappings. This will help you understand the impact of any changes.
  Consult Documentation: Review SAP documentation or consult with your SAP Basis or technical team for best practices regarding IDoc modifications.
  
  Related Information:
  
  IDoc Structure: Understand the structure of IDocs, including segments and segment types, to better manage changes.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as WE30 (IDoc Type Development) and WE31 (Segment Type Development) for managing IDocs.
  SAP Notes: Check for any SAP Notes related to IDoc management and error handling that may provide additional insights or solutions.
  Testing: Always test changes in a development or quality assurance environment before applying them to production to avoid disruptions.
  
  By following these guidelines, you can effectively manage IDoc types and avoid encountering the E0779 error in SAP.