How To Fix SPXN029 - First character '&1' of '&2' is invalid; only a(A)-z(Z) permitted

SAP Error Message - Details

• Message type: E = Error

• Message class: SPXN - Proxy Generation

• Message number: 029

• Message text: First character '&1' of '&2' is invalid; only a(A)-z(Z) permitted

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SPXN029 - First character '&1' of '&2' is invalid; only a(A)-z(Z) permitted ?

  The SAP error message SPXN029 indicates that there is an issue with the first character of a certain input string, where the first character is not a valid alphabetic character (a-z or A-Z). This error typically occurs in scenarios where a specific format is expected for identifiers, names, or codes, such as user IDs, material numbers, or other key fields.
  Cause:
  The error is triggered when the first character of the input string (denoted as '&2') is not an alphabetic character. The specific character that caused the issue is represented by '&1'. This can happen due to:
  
  Incorrect Input: The user may have entered a value that starts with a number, special character, or whitespace.
  Data Migration Issues: If data is being imported or migrated from another system, it may not conform to SAP's naming conventions.
  Configuration Errors: Custom programs or configurations may not enforce the correct validation rules.
  
  Solution:
  To resolve the SPXN029 error, you can take the following steps:
  
  Check Input: Review the input value that triggered the error. Ensure that it starts with an alphabetic character (a-z or A-Z).
  Correct Format: If the input is incorrect, modify it to start with a valid character. For example, if the input is "123abc", change it to "a123bc".
  Validation: Implement validation checks in custom programs or user exits to ensure that inputs conform to the expected format before they are processed.
  Data Cleanup: If this error arises from data migration, review the data for any entries that do not meet the naming conventions and correct them accordingly.
  
  Related Information:
  
  SAP Documentation: Refer to SAP's official documentation for guidelines on naming conventions and valid characters for specific fields.
  Transaction Codes: If this error occurs in a specific transaction, check the relevant transaction codes and their input requirements.
  User Exits and BAdIs: If you are working with custom developments, consider using user exits or Business Add-Ins (BAdIs) to enforce input validation.
  
  By ensuring that all inputs conform to the expected format, you can prevent the SPXN029 error from occurring in the future.