How To Fix FB866 - A posting rule could not be determined for external transaction &

SAP Error Message - Details

• Message type: E = Error

• Message class: FB - Batch Programs

• Message number: 866

• Message text: A posting rule could not be determined for external transaction &

What causes this issue?

The system could not determine a posting rule for the bank's external ID
(transaction code). The external transaction is &V1&, the transaction
type &V2&, and the +/- sign of the line item is &V3&.

System Response

The transaction cannot be posted.

How to fix this error?

Enter the external transaction code in Customizing for Financial
Accounting.

Procedure for System Administrators

To prevent processing from terminating in the future whenever bank
statements with unknown transaction codes are processed, you can define
the external transaction <LB>UNALLOCATED</> in the Customizing activity
<DS:SIMG.FIBLEBS_VC_T028_DC>Make Global Settings for Electronic Bank
Statement</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FB866 - A posting rule could not be determined for external transaction & ?

  The SAP error message FB866 indicates that the system could not determine a posting rule for an external transaction. This typically occurs during the processing of financial transactions, such as when posting a document in the Financial Accounting (FI) module. Here’s a breakdown of the cause, potential solutions, and related information for this error:
  Cause:
  
  Missing Configuration: The most common cause is that the posting rules for the specific external transaction type have not been defined in the system.
  Incorrect Transaction Type: The external transaction type being used may not be recognized or may not have a corresponding posting rule.
  Inconsistent Data: There may be inconsistencies in the data being posted, such as missing or incorrect account assignments.
  Authorization Issues: The user may not have the necessary authorizations to perform the transaction.
  Custom Development: If there are custom developments or enhancements in the system, they may not be handling the external transaction correctly.
  
  Solution:
  
  
  Check Configuration:
  
  Go to the configuration settings in SAP (Transaction Code SPRO).
  Navigate to Financial Accounting (FI) > General Ledger Accounting > Business Transactions > External Transactions.
  Ensure that the posting rules for the relevant external transaction type are defined correctly.
  
  
  
  Review Transaction Type:
  
  Verify that the external transaction type being used is valid and has been set up in the system.
  Check if the transaction type is correctly assigned to the relevant company code.
  
  
  
  Data Validation:
  
  Review the data being posted for any inconsistencies or missing information.
  Ensure that all required fields are filled out correctly.
  
  
  
  Authorization Check:
  
  Ensure that the user has the necessary authorizations to perform the transaction.
  Check the user roles and profiles to confirm that they include the required permissions.
  
  
  
  Consult Documentation:
  
  Review any documentation related to custom developments or enhancements that may affect the posting rules.
  
  
  
  Debugging:
  
  If the issue persists, consider debugging the transaction to identify where the posting rule determination is failing.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  FB01 (Post Document)
  FB50 (G/L Account Document Entry)
  SPRO (Customizing Implementation Guide)
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  
  Support: If the issue cannot be resolved internally, consider reaching out to SAP support for assistance, providing them with the error message details and any relevant transaction data.
  
  
  By following these steps, you should be able to identify the cause of the FB866 error and implement a solution to resolve it.