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

RW101 - Overview

• 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