Linking Sales Order and Purchase Order through Item Reservation.

Hi,

A Basic Question. We want to Link a Sales Order with Purchase Order through Inventory --> On Hand Availability --> Reservations Form.

1. What is the flow for this? Whether SO needs to be created first or PO needs to be created first?

2. Where can we see the Reservations?

3. If On hand quantity is already available still can we reserve against a PO?

4. In What scenarios the reservations will not happen?

Regards