How To Fix DMCLG178 - Class name &1 is not known in class builder

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 178

• Message text: Class name &1 is not known in class builder

What causes this issue?

Classes must actively exist in the ABAP Workbench Class Builder before
registering in the interface register

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMCLG178 - Class name &1 is not known in class builder ?

  The SAP error message DMCLG178, which states "Class name &1 is not known in class builder," typically occurs when you are trying to access or reference a class in the ABAP Class Builder that does not exist or is not recognized by the system. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Non-Existent Class: The class you are trying to use has not been created or does not exist in the system.
  Typographical Error: There may be a typo in the class name you are trying to reference.
  Authorization Issues: You may not have the necessary authorizations to view or access the class.
  Transport Issues: If the class was recently transported from another system, it may not have been imported correctly.
  Namespace Issues: The class might be in a different namespace that is not accessible in your current context.
  
  Solutions:
  
  
  Check Class Existence:
  
  Go to the Class Builder (Transaction SE24) and check if the class name exists. If it does not, you may need to create it or check with your development team.
  
  
  
  Verify Class Name:
  
  Double-check the spelling of the class name you are trying to use. Ensure that it matches exactly with what is defined in the system.
  
  
  
  Check Authorizations:
  
  Ensure that you have the necessary authorizations to access the class. You may need to contact your SAP security team to verify your permissions.
  
  
  
  Transport Check:
  
  If the class was recently transported, check the transport logs to ensure that it was imported successfully. You can use transaction STMS to review transport requests.
  
  
  
  Namespace Verification:
  
  If the class is in a different namespace, ensure that you are using the correct namespace prefix when referencing the class.
  
  
  
  Recompile or Activate:
  
  If the class exists but is not activated, try to activate it in the Class Builder.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SE24: Class Builder
  SE80: Object Navigator (to check for classes and other objects)
  SE11: Data Dictionary (to check for related database objects)
  ST22: Dump Analysis (to check for any runtime errors related to the class)
  
  
  
  Documentation: Refer to SAP Help documentation for more details on class creation and management.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or development team for further investigation.