How To Fix /SAPAPO/OM_UPGRADE121 - & characts, & classes in client & w/o int. numbers for R/3 class system

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_UPGRADE -

• Message number: 121

• Message text: & characts, & classes in client & w/o int. numbers for R/3 class system

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/OM_UPGRADE121 - & characts, & classes in client & w/o int. numbers for R/3 class system ?

  The SAP error message /SAPAPO/OM_UPGRADE121 typically relates to issues encountered during the upgrade process of SAP Advanced Planner and Optimizer (APO) systems. This error can arise due to inconsistencies or issues with the master data, particularly with characteristics and classes in the R/3 class system.
  Cause:
  
  Inconsistent Data: The error often indicates that there are inconsistencies in the characteristics and classes defined in the R/3 system. This can happen if there are missing or incorrectly defined characteristics that are expected during the upgrade.
  Missing Internal Numbers: The error may also be triggered if the system is expecting internal numbers for characteristics and classes that are not present or are incorrectly configured.
  Upgrade Issues: The error can occur during the upgrade process if the system encounters data that does not meet the new requirements or standards set by the upgraded version.
  
  Solution:
  
  Check Characteristics and Classes: Review the characteristics and classes in the R/3 system. Ensure that all required characteristics are defined correctly and that there are no inconsistencies.
  Data Consistency Check: Use transaction codes like CT04 (for characteristics) and CL02 (for classes) to check the definitions and ensure that they are consistent and correctly linked.
  Adjust Configuration: If you find any discrepancies, adjust the configuration of the characteristics and classes accordingly. This may involve creating missing characteristics or correcting existing ones.
  Run Upgrade Pre-checks: Before performing the upgrade, run the SAP upgrade pre-checks to identify any potential issues that could lead to errors during the upgrade process.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. SAP often provides patches or guidelines for resolving upgrade-related issues.
  Contact SAP Support: If the issue persists after performing the above checks and adjustments, consider reaching out to SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CT04 (Create/Change Characteristic), CL02 (Change Class), and CL01 (Create Class) to manage characteristics and classes.
  Upgrade Documentation: Review the upgrade documentation provided by SAP for your specific version to understand any changes in data structure or requirements.
  Backup Data: Always ensure that you have a backup of your data before making significant changes or performing upgrades.
  
  By following these steps, you should be able to address the /SAPAPO/OM_UPGRADE121 error and ensure a smoother upgrade process for your SAP APO system.