3179362 - Why I cannot find the service purchase order on the invoice creation screen?

I am trying to create a PO invoice for a service Purchase Order(PO). When I search for available POs, the service PO is not visible. 

When trying to create an invoice against a service Purchase Order (PO), I cannot search for the PO after clicking Create > Invoice from the home page.

I can open the service PO and press on the Invoice button to create an invoice.

CreateServiceSheet Search for service PO , KBA , BNS-ARI-INV , Invoicing , BNS-ARI-PUR-SRV , Services Procurement , Problem