====== Quotations, Checkout and Revisions ======

<flow>
graph TD;
    N[New Sale] -- Save --> Q
    C[Checkout] -- Invoice Button --> I[Invoice];
    Q[Quotation] -- Checkout Button --> C[Checkout];
    C[Checkout] -- Delivery Button --> D[Delivery Note];
    C -- Save Revision --> R[Revision]
    Q -- Save Revision --> R
    
</flow>

===== What is a quotation? =====
A Quotation is the first stage in creating a sale.
The `New Sale` area creates a quotation and when All sales start of as a Quotation 

===== What is a revision =====
A revision is a copy of a quotation.  They are useful in keeping a record of how a quotation has changed before the final invoice or delivery note is created.  Revisions are created by selecting ''Save Revision'' from the save menu.  

===== What is the checkout area? =====
The checkout area is used to reserved stock for a customer.  It is the intermediate state between a quotation and an invoice.   When a sale is 'checked out' items added or items removed will all affect the `stock on hand`.