Current stock of the delivered products.

Authorized users can cancel sale order lines.

User can see button on sale order lines.

Cancelled two products, also cancelled moves on delivery.

You can't cancel sale order lines if there is no picking.

You can cancel sale order lines only for validate pickings.

Now you can see products stock is reverted.

Also purchase received and authorized users can cancel purchase order lines.

Two products cancelled from purchase order

also cancelled moves on delivery.

You can't cancel purchase order lines if no picking.

You can cancel purchase order lines only for validate pickings.

You can see stock will be updated for cancelled purchase lines.

If you cancelled all purchase/sale order lines

Then Receipt/Delivery is cancelled.