How To Fix IS166 - Serial number & already exists for material &

IS166 - Overview

• Message type: E = Error

• Message class: IS - Equipment management

• Message number: 166

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

What causes this issue?

You are trying to create <GL:serial_number>serial number</> &V1& for
<GL:material>material</> &V2&. The serial number already exists for the
material.

System Response

The system has informed you that this combination of serial number and
<GL:material_number>material number</> already exists in your system.
However, it configured in such a way that the combination of material
number and serial number must <ZH>not</> be unique.

How to fix this error?

Make sure that your entries are correct and change them if
necessary before you continue processing.

Error message extract from SAP system. Copyright SAP SE.

IS166 - Details

• The SAP error message IS166 indicates that a serial number you are trying to assign to a material already exists in the system. This typically occurs during processes such as goods receipt, production order confirmation, or when trying to create a delivery or sales order.
  
  Cause:
  
  Duplicate Serial Number: The serial number you are trying to use has already been assigned to another material or is already in use in the system.
  Incorrect Material Number: The serial number may be associated with a different material number than the one you are currently working with.
  System Configuration: The system may be configured to enforce unique serial numbers across certain materials or plants.
  
  
  Solution:
  
  Check Existing Serial Numbers: Use transaction codes like IQ03 (Display Serial Number) to check if the serial number is already assigned to another material. If it is, you will need to use a different serial number.
  Verify Material Number: Ensure that you are using the