How To Fix TR128 - The character combinations /// //* //& //C or //L are not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: TR - Change and Transport System

• Message number: 128

• Message text: The character combinations /// //* //& //C or //L are not allowed

What causes this issue?

The field contains an invalid character combination.
For performance reasons, the replacement characters // cannot appear
immediately before other replacement characters.

System Response

Entry rejected.

How to fix this error?

Do not use this replacement formulation here.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TR128 - The character combinations /// //* //& //C or //L are not allowed ?

  The SAP error message TR128 indicates that certain character combinations are not allowed in the context of transaction codes or other identifiers within the SAP system. Specifically, the combinations mentioned (///, //*, //&, //C, //L) are reserved or restricted for specific uses and cannot be used in user-defined transaction codes or other identifiers.
  Cause:
  The error typically occurs when a user attempts to create or modify a transaction code, program name, or other identifiers using one of the restricted character combinations. These combinations are often reserved for system use or have special meanings within the SAP environment.
  Solution:
  To resolve this error, you should:
  
  
  Check the Input: Review the transaction code or identifier you are trying to create or modify. Ensure that it does not contain any of the restricted character combinations mentioned in the error message.
  
  
  Modify the Identifier: If your identifier includes any of the restricted combinations, change it to a valid format. Use alphanumeric characters and avoid special characters that are not allowed.
  
  
  Consult Documentation: If you are unsure about the allowed characters or formats, refer to the SAP documentation or guidelines for naming conventions related to transaction codes and identifiers.
  
  
  Testing: After making the necessary changes, try to save or execute the transaction again to see if the error persists.
  
  
  Related Information:
  
  SAP Documentation: Check the official SAP Help Portal or documentation for guidelines on naming conventions and reserved characters.
  SAP Community: You can also search or ask questions in the SAP Community forums, where other users and experts may provide insights or similar experiences.
  Transaction Codes: Familiarize yourself with the standard transaction codes and their formats to avoid conflicts with reserved characters.
  
  By following these steps, you should be able to resolve the TR128 error and successfully create or modify your transaction codes or identifiers in SAP.