Starting with Acumatica 2018 R1, `Advanced SO Invoices` feature allows to add stock items directly to a SO Invoices (SO303000).
On Invoices screen, it would be very useful to have available:
'Add stock item' button (which is available on Sales Orders)
information about item's availability (Qty on hand, Available, Available for shipping).
Without the information above, we don't know if we have the item in stock.
This information is missing even in Acumatica 2020R1.