How To Fix FIN_UI_DECO_IL_GEN001 - Change of posting key from &1 to &2 is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: FIN_UI_DECO_IL_GEN - Frontend Backend Decoupling - IL generic

• Message number: 001

• Message text: Change of posting key from &1 to &2 is not allowed

What causes this issue?

You tried to change the posting key from &V1& to &V2&. For G/L account
postings, you are only allowed to change the posting key from &V3& to
&V4& (or the reverse).

System Response

The posting key change is not processed.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FIN_UI_DECO_IL_GEN001 - Change of posting key from &1 to &2 is not allowed ?

  The SAP error message FIN_UI_DECO_IL_GEN001 indicates that there is an attempt to change the posting key from one value to another, which is not permitted in the current context. This error typically arises in financial transactions where specific posting keys are associated with certain types of entries, and changing them could violate business rules or system configurations.
  Cause:
  
  Posting Key Restrictions: Each posting key in SAP is configured to allow or disallow certain types of transactions. For example, some posting keys are designated for debit entries, while others are for credit entries. Changing from one to another may not be allowed based on the configuration.
  Transaction Type: The transaction you are trying to perform may not support the change of posting keys due to the nature of the financial document being processed.
  Configuration Settings: The system configuration may have specific rules that prevent changing posting keys for certain document types or in certain scenarios.
  
  Solution:
  
  Review Posting Key Configuration: Check the configuration of the posting keys involved. You can do this by navigating to the relevant configuration settings in the SAP system (usually under Financial Accounting settings).
  Use Correct Posting Key: Ensure that you are using the correct posting key for the transaction you are trying to perform. If you need to change the posting key, you may need to reverse the transaction and re-enter it with the correct key.
  Consult Documentation: Review the SAP documentation or help files related to the specific transaction you are working with to understand the rules governing posting keys.
  Check User Authorizations: Ensure that you have the necessary authorizations to perform the transaction. Sometimes, restrictions can be due to user roles and permissions.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with the transaction codes related to financial postings (e.g., FB01, FB50, etc.) to understand where the error might be occurring.
  Posting Key Table: You can check the posting key settings in the table T003 (Posting Keys) to see the configuration and restrictions associated with each key.
  Error Logs: Review any error logs or messages that accompany the error to gather more context about what might be causing the issue.
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.