In Accounts Payable there is a requirement to manage open vendor invoices (both Accounts Payable Invoice Journals - non PO and Vendor Invoice - PO) at the individual level.  

Presently, there is no one screen to see all outstanding invoices regarding of whether they are po or non-po invoices and put individual invoices on payment hold.  The requirement would be able to view all of the open invoices across company, by ageing and then place individual on invoice on hold, raise credit notes, record notes and undertake activities etc..  Once the invoice is placed on hold, nice to have would be to raise a case against the invoice.

The patterns established in the AR collections functionality could be used to in AP.