VP-4236: Add Purchase Order Number

[asvishnyakov]

https://www.chargebee.com/docs/po-number.html

A Purchase Order (PO) is a document generated by the buyer in order to authorize a purchase transaction. A PO Number uniquely identifies a purchase order and is generally defined by the buyer. The buyer will match the PO number in the invoice to the Purchase Order.

As a B2B user, I want to be able to add the ‘Purchase order’ to the order, so that we can use our internal Ref numbers for managing the orders

Blocked by
VirtoCommerce/vc-module-cart#64
VirtoCommerce/vc-module-order#177

[sonarqubecloud]

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