How To Fix FKKINV420 - Preliminary invoice &1 cannot be invoiced with other documents

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKINV - Invoicing in Contract Accounts Receivable and Payable

• Message number: 420

• Message text: Preliminary invoice &1 cannot be invoiced with other documents

What causes this issue?

It is not possible to process <DS:DE.INV_PRELIMINARY_KK>preliminary
invoice</> &v1& in an invoicing unit with other source documents or
other preliminary invoices.

System Response

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

How to fix this error?

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 FKKINV420 - Preliminary invoice &1 cannot be invoiced with other documents ?

  The SAP error message FKKINV420 indicates that a preliminary invoice (also known as a pro forma invoice) cannot be processed together with other documents in the invoicing process. This error typically arises in the context of the SAP Contract Accounts Receivable and Payable (FI-CA) module, which is used for managing customer accounts and billing processes.
  Cause:
  The error can occur due to several reasons:
  
  Document Type Restrictions: The system may have restrictions on processing preliminary invoices with certain document types. For example, you may not be able to combine a preliminary invoice with a final invoice or other types of billing documents.
  Invoicing Configuration: The configuration settings in the SAP system may not allow for the combination of preliminary invoices with other documents. This could be due to settings in the billing type or document flow.
  Incomplete Data: There may be missing or incorrect data in the preliminary invoice or the other documents that are being processed together.
  Status of Documents: The status of the preliminary invoice or the other documents may not allow them to be processed together. For example, if one document is already posted or in a different status, it may lead to this error.
  
  Solution:
  To resolve the FKKINV420 error, you can take the following steps:
  
  Check Document Types: Review the document types involved in the invoicing process. Ensure that the preliminary invoice can be processed with the other documents you are trying to invoice.
  Review Configuration: Check the configuration settings in the SAP system related to billing and invoicing. This may involve looking at the billing types and their allowed combinations.
  Verify Data Completeness: Ensure that all required fields in the preliminary invoice and the other documents are filled out correctly. Look for any missing or incorrect data that could be causing the issue.
  Check Document Status: Verify the status of the preliminary invoice and the other documents. If any document is already posted or in a status that does not allow further processing, you may need to adjust or reverse those documents.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling preliminary invoices and the related configurations.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling preliminary invoices.
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP FI-CA, such as:
  
  FPL1N: Create a preliminary invoice
  FPL2N: Change a preliminary invoice
  FPL3N: Display a preliminary invoice
  
  
  User Exits and BAdIs: If custom logic is implemented in your SAP system, check for any user exits or Business Add-Ins (BAdIs) that may affect the invoicing process.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in the FI-CA module for further assistance.