How To Fix B0166 - Function & is not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: B0 - Business Partner General

• Message number: 166

• Message text: Function & is not defined

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message B0166 - Function & is not defined ?

  The SAP error message B0166, which states "Function & is not defined," typically indicates that the system is unable to find a specific function module, method, or procedure that is being called in the program or transaction you are executing. This can occur for several reasons:
  Causes:
  
  Missing Function Module: The function module or method being called does not exist in the system. This could be due to a missing transport or an incomplete installation.
  Typographical Error: There may be a typo in the function name in the code or configuration.
  Authorization Issues: The user executing the transaction may not have the necessary authorizations to access the function.
  Namespace Issues: If the function is part of a custom namespace, it may not be properly defined or activated.
  Version Compatibility: The function may not be available in the version of SAP you are using, especially if it was introduced in a later version.
  
  Solutions:
  
  Check Function Module Existence: Use transaction SE37 (Function Builder) to check if the function module exists. If it does not, you may need to create it or transport it from another system.
  Correct Typographical Errors: Review the code or configuration for any typos in the function name and correct them.
  Review Authorizations: Ensure that the user has the necessary authorizations to execute the function. You can check this using transaction SU53 after the error occurs.
  Check Custom Namespace: If the function is part of a custom development, ensure that it is properly defined and activated in the system.
  Consult Documentation: If the function is part of a standard SAP package, refer to the SAP documentation or notes to see if there are any prerequisites or updates required.
  Debugging: If you have access to the ABAP code, you can debug the program to see where the function is being called and gather more context about the error.
  
  Related Information:
  
  Transaction Codes: SE37 (Function Builder), SE80 (Object Navigator), SE11 (Data Dictionary), SU53 (Authorization Check).
  SAP Notes: Check the SAP Support Portal for any relevant notes that might address this specific error or provide additional context.
  Community Forums: SAP Community and other forums can be useful for finding similar issues faced by other users and their solutions.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or ABAP development team for further investigation.