How To Fix MDG_SF101 - Double key error for key &1

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_SF - MDG: Sample Model SFlight

• Message number: 101

• Message text: Double key error for key &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MDG_SF101 - Double key error for key &1 ?

  The SAP error message MDG_SF101, which indicates a "Double key error for key &1," typically occurs in the context of SAP Master Data Governance (MDG) when there is an attempt to create or update a master data record that violates the uniqueness constraint of a key field. This means that the key value you are trying to use already exists in the system, leading to a conflict.
  Cause:
  
  Duplicate Key Value: The most common cause of this error is that the key value (e.g., a unique identifier like a material number, vendor number, or customer number) you are trying to create or update already exists in the database.
  Data Replication Issues: If data is being replicated from another system, there may be a timing issue where the same key is being processed simultaneously.
  Incorrect Data Entry: Users may inadvertently enter a key that is already in use due to a lack of validation or oversight.
  
  Solution:
  
  Check for Existing Records: Before creating or updating a record, check the database to see if the key value already exists. You can do this by searching for the key in the relevant master data transaction or using a report.
  Use a Unique Key: If the key is indeed a duplicate, you will need to generate or use a different unique key value that does not conflict with existing records.
  Data Validation: Implement validation checks in your data entry process to prevent users from entering duplicate keys.
  Review Data Replication Processes: If the error is related to data replication, ensure that the processes are synchronized and that there are no timing issues causing duplicates.
  Consult Logs and Traces: If the issue persists, check the application logs and traces for more detailed information about the error and the context in which it occurred.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like SE11 (Data Dictionary) to check the table structure and constraints, or SE16 to view existing records in the relevant tables.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  MDG Configuration: Review the configuration settings in MDG to ensure that the uniqueness constraints are correctly defined for the master data objects you are working with.
  User Training: Provide training to users on how to properly enter and manage master data to minimize the occurrence of duplicate keys.
  
  By following these steps, you should be able to resolve the MDG_SF101 error and prevent it from occurring in the future.