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

SAP Error Message - Details

• 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 is entered in the appropriate field when creating or processing the document. Check if the field is mandatory and fill it accordingly.
  Check Configuration:
  
  Go to the configuration settings for the document type in question (e.g., via transaction code SPRO).
  Navigate to Financial Accounting (New) > Accounts Receivable and Accounts Payable > Document Entry > Document Types.
  Verify that the document type is set up to allow external number assignment.
  
  
  Review Number Range Settings:
  
  Check the number range settings for the document type to ensure that it is correctly configured to accept external numbers.
  You can do this via transaction code SNRO (Number Range Objects) or by navigating through the configuration path mentioned above.
  
  
  User Training: If the issue is due to user error, consider providing training or documentation to ensure users understand the requirements for entering external numbers.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB60 (Enter Incoming Invoice), FB70 (Enter Outgoing Invoice), or F-28 (Post Incoming Payments) where this error might occur.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search for FQ510 in the SAP Support Portal.
  Documentation: Review SAP documentation related to external number assignment and document types for a deeper understanding of how these elements interact.
  
  By addressing the above points, you should be able to resolve the FQ510 error and successfully process your financial documents in SAP.