3459726 - Unable to add further down payment requests to the billing plan

When the first down payment request in the sales order has already been cleared, unable to add further down payment requests to the billing plan and create the billing document.

SAP S/4HANA Cloud Public Edition

1. Create sales order with billing plan and add one down payment request in the billing plan
2. Create the billing document for the down payment request
3. Post the incoming payment from the customer and the down payment is fully cleared
4. Add a second down payment request to the sales order
5. When creating the billing document for the second down payment request, the error message "Document XXX, Item YYY: Date ZZZ has already been billed" occurs.

This is the standard system behavior. It is not supported to add further down payment requests to the billing plan and create the billing document if the first down payment request in the sales order has already been cleared.

sales order, billing plan, down payment request, billing document, post the incoming payment, fully cleared, Document XXX, Item YYY: Date ZZZ has already been billed , KBA , SD-BIL-IV-DP-2CL , Down Payments (Public Cloud) , Problem