How To Fix MG429 - Session &: the special character for a blank field is >&<

SAP Error Message - Details

• Message type: E = Error

• Message class: MG - Batch input: material master

• Message number: 429

• Message text: Session &: the special character for a blank field is >&<

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 MG429 - Session &: the special character for a blank field is >&< ?

  The SAP error message MG429 indicates that there is an issue with the input of a special character in a field that is expected to be blank. Specifically, the message states that the special character for a blank field is >&<. This error typically occurs in the context of material management or inventory management transactions where certain fields are expected to be empty but contain invalid characters.
  Cause:
  
  Invalid Input: The user may have inadvertently entered a special character or a space in a field that should be left blank.
  Data Migration Issues: If data has been migrated from another system, it may contain unexpected characters in fields that should be empty.
  User Error: Users may not be aware of the requirement to leave certain fields blank or may not know how to properly clear them.
  
  Solution:
  
  Check Input Fields: Review the fields in the transaction where the error occurred. Ensure that any fields that should be blank are indeed empty and do not contain any spaces or special characters.
  Clear Fields: If a field is not supposed to have any value, make sure to clear it completely. In some cases, you may need to delete any existing characters or spaces.
  Data Validation: Implement validation checks in your data entry processes to prevent users from entering invalid characters in fields that should be blank.
  Consult Documentation: Refer to SAP documentation or help resources for the specific transaction you are using to understand the requirements for each field.
  Contact Support: If the issue persists and you cannot identify the cause, consider reaching out to your SAP support team for further assistance.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the error message MG429.
  Transaction Codes: Familiarize yourself with the transaction codes related to material management (e.g., MM01, MM02, MIGO) to understand where this error might occur.
  User Training: Provide training for users on how to properly enter data in SAP, emphasizing the importance of leaving certain fields blank when required.
  
  By following these steps, you should be able to resolve the MG429 error and ensure that your data entry processes are compliant with SAP requirements.