How To Fix EA780 - Segment & appears only in predecessor

EA780 - Overview

• 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.

EA780 - Details

• 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,