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

6A657 - Overview

• 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.

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 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