How To Fix IST_EBS121 - The taxes for the item are incompatible with the internally calc. taxes

SAP Error Message - Details

• Message type: E = Error

• Message class: IST_EBS - Interface Between IS-T and External Billing System

• Message number: 121

• Message text: The taxes for the item are incompatible with the internally calc. taxes

What causes this issue?

Control information was transferred from the external system at item
level. This data does not match the values calculated internally.

System Response

In order to maintain data consistency, the documents in question are
<ZH>not </>posted.

How to fix this error?

Check the control data transferred and/or the internal Customizing.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IST_EBS121 - The taxes for the item are incompatible with the internally calc. taxes ?

  The SAP error message IST_EBS121, which states "The taxes for the item are incompatible with the internally calculated taxes," typically occurs during the processing of documents in SAP, such as invoices or purchase orders. This error indicates a mismatch between the tax amounts specified in the document and the tax amounts that SAP calculates based on the tax configuration and rules defined in the system.
  Causes:
  
  Tax Configuration Issues: The tax codes used in the document may not be properly configured in the system, leading to discrepancies in tax calculations.
  Incorrect Tax Codes: The tax codes assigned to the line items may not correspond to the tax rates applicable for the specific transaction or jurisdiction.
  Manual Adjustments: If manual adjustments were made to the tax amounts in the document, they may not align with the system's calculated values.
  Changes in Tax Rates: If there have been recent changes in tax rates or regulations, the system may not have been updated accordingly.
  Document Type Restrictions: Certain document types may have specific tax requirements that are not being met.
  
  Solutions:
  
  Review Tax Codes: Check the tax codes assigned to the line items in the document. Ensure they are valid and correctly configured in the system.
  Verify Tax Configuration: Go to the tax configuration settings in SAP (transaction code OB40 for tax codes) and ensure that the tax rates and rules are set up correctly.
  Recalculate Taxes: If manual adjustments were made, consider reverting them and allowing SAP to recalculate the taxes based on the configured tax codes.
  Check for Updates: Ensure that the system is updated with the latest tax rates and regulations. This may involve updating the tax condition records (transaction code OBYZ).
  Consult Documentation: Review SAP documentation or consult with your SAP support team to understand any specific requirements for the document type you are working with.
  Test in a Sandbox: If possible, replicate the issue in a test environment to identify the exact cause without affecting production data.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as OB40 (Tax Codes), OBYZ (Maintain Tax Condition Records), and FB60 (Enter Incoming Invoices) to troubleshoot and resolve the issue.
  SAP Notes: Check SAP Notes for any known issues or patches related to tax calculations and the specific error message.
  User Exits and BAdIs: If custom logic is involved in tax calculations, review any user exits or BAdIs that may affect tax processing.
  
  If the issue persists after following these steps, it may be beneficial to engage with your SAP support team or consult SAP's support resources for further assistance.