District reported that unable to modify payment due date in AP Invoice on invoice with 2 cancelled items and 1 partial status item. Requested ability to modify Payment due date in this situation. USASR-402 indicates intention to implement rules to match classic - Payment due date cannot be changed if all items on the invoice are cancelled.

To Do: Update InvoicePOItem.getRemainingInvoiceable() to retrieve the existingAmount from the InvoiceRepository for this invoicePOItem and add it back the invoiceItem.amount.  If it doesn't exist (it's a new item) return zero.

The current call to the repository is now obsolete.