How To Fix CL166 - Class type & table &: engin. change mgmt not allowed for classification

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 166

• Message text: Class type & table &: engin. change mgmt not allowed for classification

What causes this issue?

Class type &V1& allows classification of different object types. To
activate engineering change management for classification, you must
activate it for the class type and for the individual object types of
the class type. Engineering change management is not activated for
object type &V2&. Deleting a class or the characteristics of a class
affects classifications, so engineering change management must be
activated for all object types of the class type.

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?

Make your change without a change number, or check the settings for the
class type and its object types in Customizing for the classification
system, in step <LS>Maintain classifiable object types</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL166 - Class type & table &: engin. change mgmt not allowed for classification ?

  The SAP error message CL166 indicates that there is an issue related to the classification of a material or object in the SAP system, specifically concerning the engineering change management (ECM) functionality. This error typically arises when you attempt to perform an operation that is not permitted due to the settings or status of the classification system.
  Cause:
  
  Engineering Change Management (ECM) Settings: The error often occurs when the ECM is not allowed for the specific class type or object you are trying to classify. This could be due to configuration settings in the classification system.
  Class Type Restrictions: Certain class types may have restrictions that prevent changes or classifications when ECM is active.
  Object Status: The object you are trying to classify may be in a status that does not allow changes or classifications.
  Authorization Issues: There may be authorization issues preventing the user from making changes to the classification.
  
  Solution:
  
  Check Class Type Configuration: Review the configuration of the class type in transaction CL02 (Change Class) or CL03 (Display Class). Ensure that the class type is set up to allow ECM.
  Review Object Status: Check the status of the object you are trying to classify. If it is locked or in a status that does not allow changes, you may need to change its status or unlock it.
  Authorization Check: Ensure that the user has the necessary authorizations to perform classification changes. This can be checked in transaction SU53 (Authorization Check) after the error occurs.
  Consult Documentation: Review SAP documentation or notes related to classification and ECM for any specific configurations or settings that may need to be adjusted.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  Transaction Codes: 
  
  CL02: Change Class
  CL03: Display Class
  CL24: Change Class Type
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional guidance.
  User Manuals: Refer to the SAP Help Portal for user manuals and guides on classification and engineering change management.
  
  By following these steps, you should be able to identify the cause of the CL166 error and implement a solution to resolve it.