How To Fix 30012 - Master record number & already exists

30012 - Overview

• 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.

30012 - Details

• 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