How To Fix RW101 - FI/CO interface: Reference key is not filled

SAP Error Message - Details

• Message type: E = Error

• Message class: RW - Interface to Accounting

• Message number: 101

• Message text: FI/CO interface: Reference key is not filled

What causes this issue?

The reference key (AWREF) was not provided by application &v1&. The
reference key contains the document number of the original document and
is required for updating the follow-on documents.

System Response

The FI/CO documents could not be posted.

How to fix this error?

Contact the SAP Hotline service.

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 RW101 - FI/CO interface: Reference key is not filled ?

  The SAP error message RW101, which states "FI/CO interface: Reference key is not filled," typically occurs in the context of financial accounting (FI) and controlling (CO) when there is an issue with the data being processed in the interface between these two modules. This error indicates that a required field, specifically the reference key, is not populated in the transaction or document being processed.
  Cause:
  
  Missing Reference Key: The reference key is a critical field that links financial documents and is often used for reconciliation and reporting. If this field is not filled, the system cannot process the transaction correctly.
  Configuration Issues: There may be configuration settings in the FI/CO interface that require the reference key to be populated, and these settings may not be aligned with the data being processed.
  Data Entry Errors: Manual data entry errors can lead to missing information in the required fields.
  Custom Developments: If there are custom programs or enhancements in place, they may not be populating the reference key correctly.
  
  Solution:
  
  Check the Document: Review the document or transaction that triggered the error. Ensure that the reference key field is filled in correctly. If it is blank, populate it with the appropriate value.
  Review Configuration: Check the configuration settings in the FI/CO interface to ensure that the reference key is set up correctly. This may involve looking at the settings in transaction codes like OBY6 (for FI) or OKEQ (for CO).
  Data Validation: Implement validation checks to ensure that the reference key is always populated when creating or processing financial documents.
  Custom Code Review: If there are custom developments, review the code to ensure that it correctly populates the reference key. Make necessary adjustments if it is not being filled as expected.
  Consult Documentation: Refer to SAP documentation or notes related to the FI/CO interface for any specific requirements regarding the reference key.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB01 (Post Document), F-02 (General Posting), and others that may be involved in the process.
  SAP Notes: Check SAP Notes for any known issues or patches related to the RW101 error message.
  User Exits and BAdIs: If applicable, consider using user exits or Business Add-Ins (BAdIs) to enforce rules around the reference key population.
  Testing: After making changes, conduct thorough testing to ensure that the issue is resolved and that the system behaves as expected.
  
  By addressing the root cause of the missing reference key and ensuring proper configuration and data entry practices, you can resolve the RW101 error and prevent it from occurring in the future.