How To Fix F1305 - Internal error: Synchronous posting not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: F1 - FI Function Module Messages

• Message number: 305

• Message text: Internal error: Synchronous posting not possible

What causes this issue?

ALE is active in your system (distributed general ledger).
An internal error appeared within this component.

System Response

The document cannot be posted.

How to fix this error?

Please contact SAP for error recovery.
Background: The command 'SET UPDATE TASK LOCAL' was installed in a
function module to ensure that all data records are updated
synchronously.
An error occurred when this command was executed. The system could not
perform a synchronous update because an update call had already been
performed asynchronously ('IN UPDATE TASK') within the function module
chain.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message F1305 - Internal error: Synchronous posting not possible ?

  The SAP error message F1305, which states "Internal error: Synchronous posting not possible," typically occurs during the execution of financial transactions, particularly when trying to post documents in the Financial Accounting (FI) module. This error can arise due to various reasons, including configuration issues, system inconsistencies, or problems with the underlying data.
  Causes:
  
  Configuration Issues: Incorrect settings in the financial accounting configuration can lead to this error. This includes issues with document types, posting keys, or account determination.
  Data Inconsistencies: If there are inconsistencies in the data being processed (e.g., missing or incorrect master data), it can trigger this error.
  System Bugs: Sometimes, this error can be caused by bugs in the SAP system or specific versions of the software.
  User Authorizations: Insufficient user authorizations to perform the posting can also lead to this error.
  Parallel Processing: If the system is trying to process multiple postings simultaneously and encounters a conflict, it may result in this error.
  
  Solutions:
  
  Check Configuration: Review the configuration settings in the Financial Accounting module. Ensure that all document types, posting keys, and account determinations are correctly set up.
  Data Validation: Validate the data being posted. Check for any missing or incorrect entries in master data (e.g., vendor/customer accounts, GL accounts).
  Review Logs: Check the application logs (transaction SLG1) for more detailed error messages that can provide insights into the root cause of the issue.
  User Authorizations: Ensure that the user attempting the posting has the necessary authorizations to perform the transaction.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error. There may be patches or updates available that resolve known issues.
  System Restart: In some cases, restarting the application server or the entire SAP system can resolve temporary issues causing the error.
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB01 (Post Document), FB50 (G/L Account Document), and FBL1N (Vendor Line Item Display) to troubleshoot and analyze the postings.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  Documentation: Review SAP documentation related to Financial Accounting for best practices and troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the cause of the F1305 error in SAP.