"purchasing document" is a correct and commonly used phrase in written English.
It refers to any type of document used in the process of purchasing goods or services, such as purchase orders, invoices, contracts, etc. Example: "Please provide a copy of the purchasing document for the new shipment of supplies so we can track the budget and expenses accurately."
On Sunday the woman, Gong Aiai, who was accused of amassing dozens of high-end properties by forging or illegally purchasing documents, was sentenced to three years in prison, according to the state-run Xinhua news service.
"We view with great alarm these purchasing documents," said the Electronic Frontier Foundation's senior staff attorney Adam Schwartz.
To meet traceability requirement, the Royal Ordinance requires those engaged in controlled aquaculture to furnish their buyers with purchasing documents in accordance with indicated form and format.
You can create a system like this yourself, or you can purchase document management software] (usually included as a part of a paperless-office-software package) to create a suitable workflow for you.
But other allegations have emerged since, most notably a report by The New York Times that Rodriguez had purchased documents from the clinic in an effort to keep them out of the hands of investigators working for Major League Baseball.
At the same time, two people briefed on the matter said, at least one player linked to the clinic has purchased documents from a former clinic employee in order to destroy them.
In the case of the anti-aging clinic, the identity of the player who purchased documents is not known, nor is it clear how much that player or Major League Baseball spent on the records they obtained.
Rodriguez has denied obtaining any banned substances from the clinic or of arranging to purchase documents from the clinic in order to keep them out of the hands of baseball's investigators.
Former employees of a now-shuttered South Florida anti-aging clinic and others who had ties to it have told Major League Baseball that the Yankees'Alex Rodriguez arranged to purchase documents from the clinic to keep them out of the hands of baseball officials, according to two people briefed on the matter.
Then in April the New York Times published a story that A-Rod had purchased documents from Biogenesis.
