What do I do when supplier send a partial delivery for an order?

Full Question

A supplier has sent a partial delivery for an order.

I have opened the PO and then gone to receipt and create and entered the details. I have then receipted it.

Under the PO there is now no sign of this receipt existing and it hasn't changed the Quantity/Received/Invoiced numbers on the PO front screen.

If you go to the products and traceability you can see the receipt.

If you go to inventory>receipts you can find the receipt.

Because it is not showing under the Purchase order an invoice cannot be received for the items.

If I go to invoicing>Supplier Invoices>Create it does show anything under the Auto-complete.

Can you advise why it isn't showing under the PO it was created under, and what can be done to post the supplier invoice?

Answer from Junari 
In order for Odoo to fully keep track of the quantities against the original purchase order, you need to enter the actual received quantities on the original receipt, then when confirming, use the Backorder functionality where Odoo will automatically create additional receipt orders for the remaining quantities.

Creating additional receipts manually unfortunately will not link to the original PO (we should hide the "Create" button on the Receipts page to prevent this confusion in future)

You'll also need to enable Backorders for your suppliers to allow this

If you have already completed the receipt without a backorder, then you can Duplicate the original receipt and receive additional items, and this will also update the received quantities on the purchase order.