SAP Knowledge Base Article - Public

1757257 - How to Set-up the Inclusion of the External Sales Order Reference Number in a Customer Invoice Request


How to set-up the inclusion of the external sales order reference number in a Customer Invoice Request.

Reproducing the Issue

  1. Go to the Customer Invoicing work center.
  2. Go to the Invoice Requests view.
  3. Show All and Find ABC (ABC represents the ID of the invoice request).
  4. Edit the invoice request and select the View All button.
  5. You cannot see the external reference sales order linked to this invoice request.
  6. Select the Invoice button to create customer invoice out of invoice request ABC.
  7. The external reference sales order is also not available in the customer invoice.


You have not configured the external reference number for the customer invoice.


  1. Go to Business Configuration work center.
  2. Go to the Overview view.
  3. Search for configuration elements containing External reference.
  4. Select the External Reference Number Determination for Customer Invoice.
  5. Select the button showing an arrow pointing down in order to add this configuration element to the shortlist.
  6. Select the Add to Change Project button.
  7. Provide a Title for your change project and a description.
  8. Select the Finish button.
  9. In your newly created change project, select Open Activity List to Implement Changes.
  10. Select the activity External Reference Number Determination for Customer Invoice.
  11. For the various document types, select the Copied from Predecessor Reference ID as a Determination Method.
  12. Select the Save and Close button.
  13. Change the status of the first activity to Closed.
  14. Select Merge Changes with Production System.
  15. Select Start Merge and confirm the popup window by selecting Continue.
  16. The merge will take a couple of minute,s and the status will be In Process.
  17. After a while the status will change to Completed.
  18. Select Close Project.

With the above steps you have configured the External Reference Number in customer invoice.

Note: The external reference number is also a split criteria for the invoices.


KBA , AP-CI , Customer Invoice Processing , How To