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

IST_EBS121 - Overview

• 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.

IST_EBS121 - Details

• 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