How To Fix 6A657 - Only one input tax code or sales tax code allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: 6A - Real estate messages rent adjustment

• Message number: 657

• Message text: Only one input tax code or sales tax code allowed

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 6A657 - Only one input tax code or sales tax code allowed ?

  The SAP error message "6A657: Only one input tax code or sales tax code allowed" typically occurs when you are trying to enter multiple tax codes in a transaction where only one is permitted. This can happen in various scenarios, such as during invoice entry, sales order processing, or when posting accounting documents.
  Cause:
  
  
  Multiple Tax Codes: The primary cause of this error is that the system is detecting more than one tax code being entered for a single line item or transaction. This can happen if:
  
  You have inadvertently selected multiple tax codes in the transaction.
  The configuration of the tax codes allows for multiple entries, but the specific transaction does not support it.
  
  
  
  Incorrect Configuration: The tax configuration in the system may not be set up correctly, leading to conflicts when trying to process transactions.
  
  
  Data Entry Error: Users may mistakenly enter multiple tax codes due to misunderstanding the input fields or system prompts.
  
  
  Solution:
  
  
  Review Tax Code Entries: Check the transaction where the error occurred and ensure that only one tax code is entered for each line item. Remove any additional tax codes that may have been inadvertently selected.
  
  
  Check Configuration: If you are an SAP administrator or have access to configuration settings, review the tax code settings in the system:
  
  Go to the transaction code OBYZ (for input tax codes) or OB40 (for sales tax codes) to check the configuration.
  Ensure that the settings align with the business requirements and that only one tax code is allowed for the relevant transactions.
  
  
  
  Consult Documentation: Refer to SAP documentation or help resources for guidance on how to properly configure tax codes and understand the limitations of the specific transaction you are working with.
  
  
  User Training: If this error is common among users, consider providing training or documentation to help them understand how to correctly enter tax codes in transactions.
  
  
  Debugging: If the issue persists and seems to be a system error rather than user error, consider debugging the transaction or consulting with SAP support for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB60 (Enter Incoming Invoices), FB70 (Enter Outgoing Invoices), and VA01 (Create Sales Order) where this error might occur.
  SAP Notes: Check SAP Notes for any known issues or patches related to tax code handling in your version of SAP.
  Tax Configuration: Understanding the tax configuration in SAP is crucial. This includes knowing how to set up tax codes, tax determination procedures, and the implications of tax jurisdiction.
  
  By following these steps, you should be able to resolve the error and ensure that your transactions are processed correctly.