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