How To Fix OT151 - The second predecessor does not refer to the same add-on

SAP Error Message - Details

• Message type: E = Error

• Message class: OT - SAP Online Correction Support (SOCS)

• Message number: 151

• Message text: The second predecessor does not refer to the same add-on

What causes this issue?

Conflict Resolution Transports can only have other CRTs or Add-On
Support Packages of the same add-on as their second predecessor.
However, &v1& refers to add-on &v2&.

System Response

The second predecessor was not registered.

How to fix this error?

Specify a valid predecessor.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OT151 - The second predecessor does not refer to the same add-on ?

  The SAP error message OT151, which states "The second predecessor does not refer to the same add-on," typically occurs in the context of managing add-ons or enhancements in SAP systems, particularly when dealing with the dependencies of these add-ons.
  Cause:
  This error usually arises when there is a mismatch in the add-on dependencies. Specifically, it indicates that the second predecessor (another add-on or component that is required for the current add-on) does not match the expected add-on version or type. This can happen due to:
  
  Version Mismatch: The add-on you are trying to install or activate may require a specific version of another add-on that is not currently installed or is of a different version.
  Incorrect Configuration: The configuration settings for the add-ons may not be set correctly, leading to inconsistencies in the expected dependencies.
  Missing Add-ons: One of the required add-ons may not be installed in the system, or it may have been removed or deactivated.
  
  Solution:
  To resolve the OT151 error, you can follow these steps:
  
  
  Check Add-on Versions: Verify that all required add-ons are installed and that their versions match the requirements specified by the add-on you are trying to work with. You can do this by checking the documentation for the add-on or using transaction codes like SICF or SPAM to view installed components.
  
  
  Review Dependencies: Look at the dependency tree of the add-ons involved. Ensure that all predecessors and successors are correctly aligned and that there are no missing components.
  
  
  Reinstall or Update Add-ons: If you find that an add-on is missing or outdated, consider reinstalling or updating it to the required version.
  
  
  Consult Documentation: Refer to the installation or upgrade documentation for the add-on to ensure that you have followed all necessary steps and that all prerequisites are met.
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error. There may be patches or updates that resolve known issues related to add-on dependencies.
  
  
  Contact SAP Support: If the issue persists after checking the above points, consider reaching out to SAP Support for further assistance. They can provide more detailed insights based on your specific system configuration.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SPAM (for add-on management) and SICF (for service activation) to help manage and troubleshoot add-ons.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can share their solutions.
  Documentation: Always refer to the official SAP documentation for the specific add-ons you are working with, as they often contain valuable information regarding compatibility and installation requirements.
  
  By following these steps, you should be able to identify and resolve the cause of the OT151 error in your SAP system.