How To Fix IS121 - Serial number &1 already exists for material &2

SAP Error Message - Details

• Message type: E = Error

• Message class: IS - Equipment management

• Message number: 121

• Message text: Serial number &1 already exists for material &2

What causes this issue?

You are trying to create <GL:serial_number>serial number</> &V1& for
the <GL:material>material</>.
This combination of <GL:material_number>material number</> and serial
number already exists in your system.

System Response

INCLUDE 'KEINE-FUNKTION' OBJECT DOKU ID TX LANGUAGE E
Your system has been configured in such a way that the combination of
material number and serial number must be unique. Therefore, you cannot
assign a serial number to a material twice.

How to fix this error?

Enter a serial number that has not been assigned for this material.
If this is not possible, contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IS121 - Serial number &1 already exists for material &2 ?

  The SAP error message IS121 indicates that a serial number you are trying to assign to a material already exists in the system. This typically occurs in scenarios where serial number management is enabled for a material, and the system is designed to ensure that each serial number is unique.
  Cause:
  
  Duplicate Serial Number: The serial number you are trying to assign has already been assigned to another instance of the same material or a different material in the system.
  Incorrect Data Entry: There may have been a mistake in entering the serial number, leading to an attempt to assign a serial number that is already in use.
  System Configuration: The material may be configured to require unique serial numbers, and the system is enforcing this rule.
  
  Solution:
  
  Check Existing Serial Numbers: Use transaction codes like IQ03 (Display Serial Number) to check if the serial number already exists in the system. If it does, you will need to use a different serial number.
  Verify Material and Serial Number: Ensure that you are entering the correct material number and serial number combination. Double-check for typos or errors in the input.
  Use a Unique Serial Number: If the serial number is indeed in use, generate or assign a new, unique serial number for the material.
  Review Serial Number Management Settings: If you believe the serial number should not be unique, review the material master settings and serial number management configuration to ensure they align with your business processes.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  IQ01 (Create Serial Number)
  IQ02 (Change Serial Number)
  IQ03 (Display Serial Number)
  
  
  Material Master Data: Check the material master data for the specific material to ensure that serial number management is set up correctly.
  Documentation: Refer to SAP documentation or help resources for more detailed information on serial number management and error handling.
  User Authorization: Ensure that you have the necessary authorizations to create or modify serial numbers in the system.
  
  By following these steps, you should be able to resolve the IS121 error and successfully manage serial numbers in your SAP system.