A is your client; B is your client’s customer. B need X material, but X material is now out of stock, then you can solve this problem?   

Pandit Gandharv
@[email protected] | Updated 01 Jan. 2019

 In this case, we are using third-party process. This process uses a purchase order (Which is sent to you by the vendor). Also, invoice verification is used further along the process to check that the invoices you send to your customer are the same material and quantity as that which the vendor sent to the customer (But obviously shipped directly to your customer).