How To Fix IST_EBS151 - Line &1 of IDoc &2 has an unexpected segment name

SAP Error Message - Details

• Message type: E = Error

• Message class: IST_EBS - Interface Between IS-T and External Billing System

• Message number: 151

• Message text: Line &1 of IDoc &2 has an unexpected segment name

What causes this issue?

The function module called can only process segments of a certain type.
The current document contains a segment type that cannot be processed.

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?

If the unknown segment type is an enhancement to the IDoc, you must
create a new function module.
If the unkown segment type is an error that occurred while the IDoc was
being created, the IDoc must be created a second time in the external
billing system.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IST_EBS151 - Line &1 of IDoc &2 has an unexpected segment name ?

  The SAP error message IST_EBS151 indicates that there is an issue with the structure of an IDoc (Intermediate Document) being processed. Specifically, it states that line &1 of IDoc &2 has an unexpected segment name. This typically means that the IDoc contains a segment that is not recognized or expected based on the IDoc type definition.
  Cause:
  
  Incorrect IDoc Structure: The IDoc may have been generated incorrectly, leading to unexpected segment names.
  Version Mismatch: The IDoc might be using a version that is not compatible with the receiving system or the expected structure.
  Custom Segments: If custom segments have been added to the IDoc type, they may not be recognized by the receiving system.
  Data Corruption: The IDoc data may have been corrupted during transmission or processing.
  
  Solution:
  
  Check IDoc Structure: Verify the structure of the IDoc against the expected structure in the SAP system. You can use transaction WE60 to display the IDoc type and its segments.
  Validate IDoc Data: Use transaction WE19 to simulate the IDoc processing and check for any discrepancies in the segment names.
  Review Customizations: If there are custom segments, ensure that they are properly defined in the receiving system and that the IDoc type is correctly configured to handle them.
  Check for Updates: Ensure that both the sending and receiving systems are updated and compatible with the IDoc version being used.
  Error Logs: Review the error logs in transaction WE02 or WE05 for more details on the specific IDoc and the error encountered.
  Reprocess IDoc: If the IDoc is found to be incorrect, you may need to correct the data and reprocess the IDoc.
  
  Related Information:
  
  IDoc Types: Each IDoc type has a specific structure defined in the SAP system. Understanding the segments and their expected names is crucial for troubleshooting.
  IDoc Documentation: Use transaction WE60 to access documentation for IDoc types, which can help clarify the expected segments.
  SAP Notes: Check SAP Notes for any known issues related to the specific IDoc type or error message. This can provide additional context or solutions.
  IDoc Monitoring: Regularly monitor IDocs using transaction WE02 or WE05 to catch issues early and maintain data integrity.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.