How To Fix FQ510 - External number assignment not possible; external request number missing

FQ510 - Overview

• Message type: E = Error

• Message class: FQ - Payment Requests and Payment Program

• Message number: 510

• Message text: External number assignment not possible; external request number missing

What causes this issue?

You have selected the external assignment of the request number in the
input file of program RFBIBLK0 in structure BBKPF_FM. However, you have
not entered a request number in field LOTKZ.

System Response

The request cannot be created.

How to fix this error?

Specify an external request number in the input file of structure
BBKPF_FM in field LOTKZ or select the internal assignment of the request
number by deleting the indicator from the field
<DS:DE.FM_LOTEXNO>LOTEXNO</>.

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 FQ510 - External number assignment not possible; external request number missing ?

  The SAP error message FQ510: "External number assignment not possible; external request number missing" typically occurs in the context of financial document processing, particularly when dealing with external number ranges for documents such as invoices or payment requests. This error indicates that the system is expecting an external number (like a reference number) to be provided, but it is missing.
  Causes:
  
  Missing External Number: The most common cause is that the external number (e.g., invoice number, payment reference) is not provided in the transaction.
  
  Configuration Issues: The number range configuration for the document type may not be set up correctly, or the external number assignment is not enabled for the specific document type.
  Document Type Settings: The document type being used may not be configured to allow external number assignment.
  User Input Error: The user may have forgotten to enter the required external number in the relevant field.
  
  Solutions:
  
  Provide External Number: Ensure that the external number