How To Fix EA780 - Segment & appears only in predecessor

SAP Error Message - Details

• Message type: E = Error

• Message class: EA - IDoc Basis Messages

• Message number: 780

• Message text: Segment & appears only in predecessor

What causes this issue?

Segment &v1& is in the predecessor, but not in the current basic
type/extension.

System Response

This is an inconsistency, since all segments of the predecessor must be
in its successor.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EA780 - Segment & appears only in predecessor ?

  The SAP error message EA780, which states "Segment & appears only in predecessor," typically occurs in the context of the SAP system when dealing with IDoc processing or when working with the ALE (Application Link Enabling) interface. This error indicates that a specific segment is expected to appear in a certain sequence or hierarchy but is found only in a predecessor segment, which violates the expected structure of the IDoc.
  Cause:
  
  IDoc Structure Violation: The error usually arises when the IDoc structure is not followed correctly. For example, a segment that is supposed to be a child of another segment is not present in the expected hierarchy.
  Mapping Issues: If you are using a mapping tool (like SAP PI/PO or other middleware), there might be a mapping issue where the segments are not being correctly transformed or routed.
  Configuration Errors: Incorrect configuration in the IDoc type or message type can lead to this error, where the segments are not defined properly in the IDoc structure.
  
  Solution:
  
  Check IDoc Structure: Review the IDoc structure in transaction WE30 (IDoc Types) or WE31 (Segment Types) to ensure that the segments are defined correctly and in the right hierarchy.
  Validate IDoc Data: Use transaction WE19 (Test tool for IDocs) to simulate the IDoc and check if the segments are being populated correctly. This can help identify if the issue is with the data being sent.
  Review Mapping: If you are using middleware for mapping, check the mapping logic to ensure that the segments are being correctly transformed and that the hierarchy is maintained.
  Configuration Review: Check the configuration settings in transaction WE20 (Partner Profiles) to ensure that the settings for the sender and receiver are correct and that the message types are properly defined.
  Debugging: If necessary, you can debug the IDoc processing to see where the error is occurring and what data is being processed at that time.
  
  Related Information:
  
  IDoc Documentation: Familiarize yourself with the IDoc documentation available in SAP Help Portal to understand the structure and rules governing IDocs.
  Transaction Codes: Common transaction codes related to IDocs include:
  
  WE02: Display IDocs
  WE05: IDoc List
  WE19: Test IDoc
  WE30: IDoc Types
  WE31: Segment Types
  WE20: Partner Profiles
  
  
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message.
  
  By following these steps, you should be able to identify the root cause of the EA780 error and implement the necessary corrections to resolve it.