How To Fix 30012 - Master record number & already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: 30 - Service Master: Basic Data

• Message number: 012

• Message text: Master record number & already exists

What causes this issue?

You wish to create a master record with the specified number in the
database. However, a master record with the number you have chosen
already exists there.

How to fix this error?

Please choose a different number as the key for the data record.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 30012 - Master record number & already exists ?

  The SAP error message "30012 Master record number & already exists" typically occurs when you are trying to create a new master record (such as a vendor, customer, or material) in the SAP system, but the record number you are attempting to use is already in use by an existing record. This can happen in various modules, including Materials Management (MM), Sales and Distribution (SD), and others.
  Cause:
  
  Duplicate Entry: The most common cause is that the master record number you are trying to create already exists in the system.
  Incorrect Number Range: The number range configuration for the master record may not be set up correctly, leading to conflicts.
  Data Migration Issues: If data was migrated from another system, there may be overlaps in master record numbers.
  User Error: The user may have mistakenly entered a number that is already assigned to another record.
  
  Solution:
  
  
  Check Existing Records: Before creating a new master record, check if the record number already exists. You can do this by searching for the record in the relevant transaction (e.g., transaction codes like MM03 for materials, BP for business partners, etc.).
  
  
  Use a Different Number: If the record number is already in use, choose a different number that is not currently assigned to any existing record.
  
  
  Review Number Ranges: Check the configuration of number ranges for the specific master record type. Ensure that the number range is correctly defined and that there are no overlaps.
  
  
  Data Cleanup: If the error is due to data migration, you may need to clean up the existing data to remove duplicates or reassign numbers.
  
  
  Consult Documentation: Refer to SAP documentation or your organization's SAP support team for specific guidance related to the master record type you are working with.
  
  
  Authorization Check: Ensure that you have the necessary authorizations to create or modify master records in the system.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for managing master records, such as MM01 (Create Material), MM02 (Change Material), BP (Business Partner), etc.
  Number Range Configuration: You can check and configure number ranges using transaction code SNRO (Number Range Objects).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Training: Ensure that users are trained on how to properly create and manage master records to avoid duplication.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a technical consultant for further assistance.