How To Fix /PM0/AB_AT123 - Combination SDS = &1 / PDS = &2 already exists in this sequence

SAP Error Message - Details

• Message type: E = Error

• Message class: /PM0/AB_AT -

• Message number: 123

• Message text: Combination SDS = &1 / PDS = &2 already exists in this sequence

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PM0/AB_AT123 - Combination SDS = &1 / PDS = &2 already exists in this sequence ?

  The SAP error message /PM0/AB_AT123 Combination SDS = &1 / PDS = &2 already exists in this sequence typically occurs in the context of Advanced Planning and Optimization (APO) or similar modules where you are dealing with sequences of production or planning data. This error indicates that there is an attempt to create or modify a sequence that already contains a combination of a Source Data Structure (SDS) and a Product Data Structure (PDS) that is already defined.
  Cause:
  
  Duplicate Entry: The most common cause of this error is that the combination of the specified SDS and PDS already exists in the system. This can happen if you are trying to create a new sequence or modify an existing one without checking for existing entries.
  Data Integrity Issues: There may be issues with data integrity where the system is not correctly recognizing existing entries due to inconsistencies in the database.
  Configuration Errors: Incorrect configuration settings in the planning area or master data settings can lead to this error.
  
  Solution:
  
  Check Existing Entries: Before creating or modifying a sequence, check the existing sequences to see if the combination of SDS and PDS already exists. You can do this by navigating to the relevant transaction or using the appropriate reporting tools in SAP.
  Modify Existing Sequence: If the combination already exists and you need to make changes, consider modifying the existing sequence instead of creating a new one.
  Delete Duplicate Entries: If you find that there are duplicate entries that should not exist, you may need to delete the unnecessary ones. Be cautious with this step to avoid data loss.
  Consult Documentation: Review the relevant SAP documentation or help files for specific instructions related to your version of SAP and the module you are working with.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with SAP experts who can provide guidance based on your specific system configuration.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes related to planning and sequences, such as /SAPAPO/SDP94 for viewing sequences.
  Master Data Management: Ensure that your master data is correctly set up and that there are no inconsistencies that could lead to this error.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches or updates that could resolve underlying issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.