How To Fix E2128 - Do not use underscores in type group names

SAP Error Message - Details

• Message type: E = Error

• Message class: E2 - DE Data Dictionary

• Message number: 128

• Message text: Do not use underscores in type group names

What causes this issue?

The name of the object contains an underscore. This is not allowed by
the SAP name conventions.

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?

Please remove the underscore.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E2128 - Do not use underscores in type group names ?

  The SAP error message E2128, which states "Do not use underscores in type group names," typically occurs when you are trying to create or modify a type group in ABAP (Advanced Business Application Programming) and the name you have chosen includes underscores. In ABAP, type group names must adhere to specific naming conventions, and the use of underscores is not permitted.
  Cause:
  The primary cause of this error is the inclusion of underscores in the name of the type group you are trying to create or modify. SAP has specific naming conventions for various objects, and type groups are one of them. According to these conventions, type group names should consist of alphanumeric characters and should not include special characters like underscores.
  Solution:
  To resolve this error, you need to rename the type group to comply with SAP's naming conventions. Here are the steps you can follow:
  
  
  Choose a New Name: Select a new name for your type group that does not include underscores. You can use a combination of letters and numbers, ensuring that it starts with a letter.
  
  
  Modify the Type Group: If you are creating a new type group, simply enter the new name without underscores. If you are modifying an existing type group, you may need to delete the existing one (if it is not yet used) and create a new one with the correct name.
  
  
  Check Naming Conventions: Ensure that the new name adheres to the following conventions:
  
  Must start with a letter.
  Can contain letters and numbers.
  Should not exceed the maximum length (typically 30 characters).
  
  
  
  Save Changes: After renaming, save your changes and activate the type group.
  
  
  Related Information:
  
  ABAP Naming Conventions: Familiarize yourself with the general naming conventions in ABAP to avoid similar issues in the future. This includes rules for naming variables, data elements, tables, and other objects.
  Documentation: Refer to the official SAP documentation or the ABAP programming guidelines for more detailed information on naming conventions and best practices.
  Error Handling: If you encounter similar errors, check the exact message and context, as it may provide clues about what needs to be corrected.
  
  By following these steps, you should be able to resolve the E2128 error and successfully create or modify your type group in SAP.