Misleading Requisition Statuses after any activity post Billing

Summary:

Requisition Status remains Billed, even when invoice is cancelled. It also does not change when the PO/PO lines is also cancelled.

The new statuses introduced with RSSP are good however this scenario creates lot of confusion.

You can try to reproduce the scenario at will if you follow the below steps:

1. Create Requisition (single or multi line)
2. Create PO 
3. Create Invoice 
4. Validate it
5. Cancel the Invoice line or the whole invoice
6. Cancel the corresponding PO lines for which the invoice/invoice lines were cancelled.
7. The Requisition line status still shows as 'Billed' which is misleading.

This is happening for all scenarios - single line, multiple line PR with single/multiple POs and single/multiple/multiple line Invoices.