Order Records a Research Buyer Should Keep: The Purchase Side of Provenance

A research buyer should keep, for every order, the documents that tie money to material: the quotation or order confirmation, the invoice, proof of payment, the supplier's answers to any pre-order questions, the shipping and customs documents, the lot-matched certificate of analysis, the receiving record, and any correspondence about problems. Keep them at least as long as the longest obligation that depends on them — tax, grant or customs rules, or the life of the data generated from the material, whichever runs longest. File them so that one identifier, your own receiving code or the supplier's lot number, finds all of them in under a minute.

This is not the same record as a lot register. A lot register describes what physically exists in the laboratory, container by container. The purchase record describes how each container came to be there: who sold it, under what terms, with what paperwork, at what price. The register answers "what is this and where is it"; the purchase record answers "where did it come from, and what were we told". The second is the commercial half of provenance, and it is the half that tends to live in someone's inbox.

What to retain

For how long

There is no single retention period for research purchases, because several rules overlap and the longest one governs. For work funded by a US federal award, recipients must retain all award records for three years from the date the final financial report is submitted ^[1], which can be many years after the purchase itself. For tax purposes the IRS's default is three years from filing, with longer periods in specific circumstances ^[2]. A Canadian business generally keeps records and supporting documents for six years from the end of the last tax year they relate to ^[3]. Where material was imported into the United States, customs recordkeeping rules require import records to be kept for five years from the date of entry ^[4].

Those are floors, set for other purposes. The research reason often runs longer: a purchase record is needed for as long as anyone may ask where the material behind a result came from, which for a published result is effectively the life of the publication. A workable rule for a small group is to keep the purchase record for as long as the data generated from that lot are kept, and never less than the longest statutory period that applies. Check your institution's own policy, which may set a longer period still.

Linking invoice to batch to certificate to notebook

Four documents form one chain, and each link is a single identifier that must appear on both sides of it. The invoice names the item and, ideally, the lot; the lot number appears on the container and on the certificate; your receiving code ties the container to the receiving record; and the notebook entry for any work cites that receiving code or the lot. Break any link and the chain cannot be followed from a result back to a payment, or forward from a recalled lot to the work that used it. The purchase side ends at the lot, and the record set a lot accumulates from receipt to first use picks up from there.

1. Ask the supplier to print the lot number on the invoice line, or write it on your copy when the parcel arrives.
2. Check that the lot on the certificate matches the lot on each container before filing either.
3. Assign your receiving code and write it on the invoice copy, the certificate copy and the receiving record.
4. Cite the receiving code or lot in every notebook entry that uses the material, following how a notebook entry is made so that it holds up later.
5. When a problem is reported, file the correspondence under the same code.

Why the purchase record is part of provenance

Provenance is the documented history of where a material came from and what happened to it. The scientific side of it — identity, purity, handling — gets most attention, but a result cannot be traced to a material without knowing who supplied it and what they said about it. Journals have moved in the same direction. The MDAR framework, developed by a working group including several major publishers and adopted as a minimum reporting standard for life-science papers, lists materials as one of its four core areas and asks authors to report the source of key materials along with their identifiers ^[5]. The same record serves the materials and methods section of a paper, where the source of a compound is expected to be stated rather than implied.

Digital storage and retrieval

The commonest failure is not losing a document but not being able to find it: the invoice in one person's inbox, the certificate in a downloads folder, the receiving record on a clipboard. A simple structure fixes most of it. One folder per order, named with the date in year-month-day order and the supplier's order number; inside it, every document for that order, named consistently. Keep the folder in shared storage the group controls, not in a personal account that leaves with its owner. ISO/IEC 17025, written for testing laboratories, expects records to be retained, protected and retrievable, with changes to them traceable ^[6]; the same properties are what make a small group's purchase records usable years later.

• Save documents as PDF where possible, and save web pages such as terms and shipping policies as dated PDFs.
• Forward order emails to a shared mailbox or save them into the order folder the day they arrive.
• Keep an annual read-only export of the whole structure somewhere the live folders are not.
• Do not rename a supplier's lot number or certificate number when filing; search depends on the printed form.

What an auditor, reviewer or institution asks for

The questions are predictable, and the minimum record set is whatever answers them without anyone relying on memory. A grant auditor asks what was bought, from whom, for how much and whether it was an allowable cost ^[1]. A customs or tax authority asks for the invoice, the entry and proof of payment ^[3][4]. A journal reviewer asks where a key material came from and how its identity was established ^[5]. An institution's research-integrity office, looking back at a result, asks which lot was used and whether anything was known to be wrong with it at the time.

A minimum record set

• Order folder named by date and supplier order number.
• Order confirmation, invoice and proof of payment.
• The supplier's pre-order answers and a dated copy of the terms and shipping policy.
• Shipping documents, and for imports the entry number and broker correspondence.
• Lot-matched certificate of analysis for each lot received.
• Receiving record with your receiving code.
• Any complaint thread and its recorded outcome.
• A note of where the lot register row and the relevant notebook entries can be found.

What purchase records cannot do

A complete purchase record proves what was bought, from whom, and what the seller said. It does not prove that what the seller said was true, and it does not replace analysis of the material. What it does is make every other record interpretable: an analytical result, a complaint, a recall notice or a reviewer's question can be tied to a specific lot and a specific transaction, which is the whole point of provenance ^[5][6].