How To Fix C1818 - Object "&" already classified with same characteristic values

SAP Error Message - Details

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 818

• Message text: Object "&" already classified with same characteristic values

What causes this issue?

With object '&V1&', an object with the same characteristic value was
already classified with class '&V2&' of class type '&V3&'. In class
maintenance, it was defined whether a warning message or error message
is to be displayed in this case. This draws your attention to potential
redundancies.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Change the assigned characteristic value so that you do not have
redundancies in your system.
The object you are classifying may not be necessary, because it can be
replaced by the object found by the system.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C1818 - Object "&" already classified with same characteristic values ?

  The SAP error message C1818, which states "Object '&' already classified with same characteristic values," typically occurs in the context of classification in SAP, particularly when dealing with class management and object classification.
  Cause:
  This error arises when you attempt to classify an object (such as a material, equipment, or any other master data) with characteristic values that are already assigned to that object in the classification system. In other words, the system detects that the object is already classified with the same set of characteristics and values you are trying to assign again.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Classifications:
  
  Navigate to the classification view of the object in question and review the existing classifications. Ensure that the characteristic values you are trying to assign are not already present.
  
  
  
  Modify Existing Classification:
  
  If you need to change the characteristic values, you can either modify the existing classification or remove it before reclassifying the object with the new values.
  
  
  
  Use Different Characteristic Values:
  
  If the intention is to classify the object differently, consider using a different set of characteristic values that do not conflict with the existing ones.
  
  
  
  Review Class Hierarchy:
  
  Ensure that the class hierarchy is correctly set up and that you are not inadvertently trying to classify the object in a way that violates the classification rules.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for more detailed guidance on classification and object management.
  
  
  
  Check Authorization:
  
  Ensure that you have the necessary authorizations to modify classifications in the system.
  
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CL02 (Change Class), CL03 (Display Class), or CL24 (Display Object) to manage classifications.
  Classification System: Understanding the classification system in SAP, including classes, characteristics, and values, is crucial for effective management.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues or provide patches related to classification errors.
  
  If the problem persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in classification and master data management.