How To Fix DMU134 - Relationship between &1 and &2 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: DMU - Digital Mock Up (DMU)

• Message number: 134

• Message text: Relationship between &1 and &2 already exists

Self-Explanatory Message

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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 DMU134 - Relationship between &1 and &2 already exists ?

  The SAP error message DMU134, which states "Relationship between &1 and &2 already exists," typically occurs in the context of data management, particularly when dealing with master data relationships in SAP systems. This error indicates that there is an attempt to create a relationship between two entities (like materials, vendors, customers, etc.) that already has an existing relationship in the system.
  Cause:
  
  Duplicate Relationship: The primary cause of this error is that the relationship you are trying to create already exists in the database. For example, if you are trying to link a material to a vendor, and that link already exists, you will encounter this error.
  Data Entry Error: Sometimes, this can occur due to incorrect data entry or an oversight where the user is not aware that the relationship has already been established.
  System Configuration: In some cases, the system configuration or settings may lead to this error if the relationship rules are not properly defined.
  
  Solution:
  
  Check Existing Relationships: Before attempting to create a new relationship, check the existing relationships between the two entities. You can do this by using transaction codes like SE16 or SE11 to view the relevant database tables.
  Modify Existing Relationship: If the relationship already exists but needs to be updated or modified, consider using the appropriate transaction to change the existing relationship instead of creating a new one.
  Error Handling: Implement error handling in your process to catch this error and provide a user-friendly message or alternative actions.
  Consult Documentation: Review the SAP documentation or help files related to the specific module you are working with to understand the rules governing relationships.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that can help you manage relationships, such as:
  
  BP (Business Partner)
  MM01 (Create Material)
  MM02 (Change Material)
  
  
  Tables: Understand the underlying tables that store relationship data, such as:
  
  MARA (General Material Data)
  LFA1 (Vendor Master)
  KNA1 (Customer Master)
  
  
  SAP Notes: Check for any SAP Notes related to this error message for potential patches or updates that may address the issue.
  
  By following these steps, you should be able to identify the cause of the DMU134 error and take appropriate action to resolve it.