How To Fix CH051 - The class contains invalid characters. Allowed: A-Z, 0-9, -_.

SAP Error Message - Details

• Message type: E = Error

• Message class: CH - CAD/PP integration messages

• Message number: 051

• Message text: The class contains invalid characters. Allowed: A-Z, 0-9, -_.

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CH051 - The class contains invalid characters. Allowed: A-Z, 0-9, -_. ?

  The SAP error message CH051 indicates that there is an issue with the naming convention of a class in the SAP system. Specifically, it means that the class name you are trying to use contains invalid characters. According to the error message, the allowed characters for class names are:
  
  Uppercase letters: A-Z
  Digits: 0-9
  Special characters: - (hyphen), _ (underscore), . (dot), ? (question mark)
  
  Cause
  The error typically occurs when:
  
  The class name includes lowercase letters or other special characters that are not permitted.
  There may be leading or trailing spaces in the class name.
  The class name may be too long or not conforming to the naming conventions set by your organization or SAP standards.
  
  Solution
  To resolve the CH051 error, follow these steps:
  
  
  Check the Class Name: Review the class name you are trying to create or modify. Ensure that it only contains the allowed characters (A-Z, 0-9, -_.?).
  
  
  Remove Invalid Characters: If you find any invalid characters, replace them with valid ones. For example, if your class name is myClass!, change it to MYCLASS.
  
  
  Check for Case Sensitivity: Ensure that you are using uppercase letters where required, as class names in SAP are typically expected to start with an uppercase letter.
  
  
  Trim Spaces: Make sure there are no leading or trailing spaces in the class name.
  
  
  Follow Naming Conventions: If your organization has specific naming conventions, ensure that your class name adheres to those rules.
  
  
  Test Again: After making the necessary changes, try to create or modify the class again to see if the error persists.
  
  
  Related Information
  
  SAP Documentation: Refer to the SAP documentation for guidelines on naming conventions for classes and other objects.
  SAP Community: You can search for similar issues in the SAP Community forums, where other users may have encountered and resolved the same error.
  Transaction Codes: If you are working in the ABAP Workbench, you might be using transaction codes like SE80 (Object Navigator) or SE24 (Class Builder) to manage classes.
  
  By following these steps, you should be able to resolve the CH051 error and successfully create or modify your class in SAP.