National Lampoons Pucked

Scenario 1. You create purchase order and send it to supplier. Supplier starts delivering but can’t fulfil whole order. There might be multiple deliveries. You need to receive items and process multiple invoices. Key assumption – every delivery has separate invoice.

There are no many steps involved. It's 'Clone Keep PO #' function. It works in the following way
1. You create order e.g. for 10 different items.
2. Supplier delivers only 6 items .
3. You receive only 6 items and fill invoice for 6 items only.
4. Than you click 'Clone Keep PO #' link. System will calculate the difference and create new invoice for 4 remaining items.
5 Supplier deliver only 3. You repeat steps 2-4.

Scenario 2. You create purchase order and send it to supplier. Supplier starts delivering but can’t fulfil whole order. The invoice comes with first delivery. There might be multiple deliveries but single invoice. You need to receive items. Key assumption is - only one invoice per purchase order but multiple deliveries.
1. Create purchase order.
2. Process invoice
3. Start processing Received goods. Tick checkbox only on the items you received
4. Next delivery tick other set of items and Save order.
5. Authorise Received tab only when all items are received.