Tunde approved a request for new laptops for his sales team. Three weeks later, a vendor called asking why an invoice for a different amount had gone unpaid. Nobody in the office could explain the gap. That confusion is what happens when a business treats a purchase requisition and a purchase order as the same thing.
They are not. One is an internal ask. The other is an external commitment. Knowing where one ends and the other begins protects your cash, your vendor relationships, and your audit trail.
What Is a Purchase Requisition?
A purchase requisition is an internal document an employee or department submits to ask permission to buy something. It states what is needed, why, the estimated cost, and who is requesting it. Nobody outside the company ever sees this document.
Think of it as a conversation between an employee and the finance team. A marketing officer wants new banners for a trade show. She fills out a request stating the item, quantity, estimated price, and reason. Her manager reviews it. Finance checks it against the budget. Only after approval does anything move forward.
This step protects a business from unplanned spending. Without it, employees could buy whatever they want and hope finance figures it out later. With it, every purchase has a paper trail before money changes hands. Most Nigerian SMEs that lack a formal process rely on verbal approval instead, usually a WhatsApp message or a quick nod from a manager. That works until the business grows past a handful of staff, and then it becomes impossible to track who approved what.
What Is a Purchase Order?
A purchase order is what a request becomes after it gets approved. It is a formal document sent to a supplier, confirming exactly what the business wants to buy, at what price, and under what terms. Once a vendor accepts it, the document becomes a binding commitment.
It includes details the earlier internal form does not need: the vendor’s legal name, a unique reference number, delivery address, payment terms, and delivery dates. This is the document your supplier will hold you to if prices shift or timelines slip.
Unlike the internal request that came before it, this document carries legal weight. If your business issues one and the vendor accepts it, both sides are expected to honour it. That is why finance teams treat this stage with more caution than the earlier approval step. A supplier who has already accepted terms in writing has grounds to push back, or even take legal action, if a Nigerian business tries to change the price or walk away after goods have shipped.
Purchase Requisition vs Purchase Order: The Core Differences
Here is the simplest way to separate the two.
One looks inward. It exists to get permission. The other looks outward. It exists to confirm a transaction. The internal request never leaves your company. The document that follows it goes straight to your supplier.
Timing matters too. The request always comes first. The formal commitment to a vendor only exists once someone has approved the request behind it. You cannot skip the approval stage and still call the resulting document a properly controlled one, even if the paperwork looks similar.
Legal weight is another dividing line. A request is not binding. You can reject it, revise it, or shelve it with no consequence outside your company. Once your supplier accepts the document that follows, it becomes binding. Cancel it carelessly and you risk a dispute, a penalty, or a damaged vendor relationship.
Finally, think about who is involved. The internal ask passes between an employee, a manager, and finance. The external document involves your procurement team and a vendor. Different audiences, different stakes, and different levels of risk if something goes wrong.
Why the Difference Matters for Financial Control
This is not just terminology. For a Nigerian business managing tight margins and a volatile naira, the gap between these two documents is where money leaks.
Nigeria loses an estimated ₦10 trillion a year to employee fraud, according to the Centre for the Promotion of Private Enterprise, and procurement kickbacks are one of the most common schemes behind that figure. Global occupational fraud research puts the typical loss at five to ten percent of annual revenue, and small businesses lose proportionally more than larger ones because their internal controls are weaker. A common trick: an employee inflates an invoice, colludes with a supplier, or invents a purchase entirely, betting nobody will compare the original internal request to what actually got paid for.
This is not a problem unique to large corporations. Research on small and medium enterprises in Lagos found that businesses without formal internal controls were far more exposed to fraud than those with even basic checks in place, including something as simple as requiring a manager’s signature before spending moves forward. Weak bookkeeping, cash-heavy transactions, and informal hiring all widen the gap. The fix is rarely expensive software or a new department. Often it is just enforcing the sequence: request first, approval next, formal commitment to the vendor last.
A disciplined purchase requisition process closes that gap early. Every request gets reviewed against budget before a naira leaves the business. A disciplined purchase order process closes the second gap. Every payment gets matched against a specific, approved commitment, so an employee cannot quietly pay a “vendor” who never delivered anything.
Skip the purchase requisition stage and you lose visibility into what your team is asking for before money is spent. Skip the purchase order stage and you lose your paper trail with suppliers, along with your leverage if a price or delivery date changes. Together, a proper purchase requisition and purchase order system gives a business owner or finance manager the full picture: who asked for what, who approved it, and what was actually promised to a vendor.
For diaspora founders running Nigerian businesses from abroad, this matters even more. You cannot walk into the office and ask questions in person. A clear purchase requisition and purchase order trail is often the only real-time evidence you have that spending is happening the way you expect it to.
Common Mistakes Nigerian Businesses Make
A few habits quietly undo the value of both documents.
The first is letting purchase orders get issued without a matching purchase requisition on file. This usually happens when a manager is in a hurry and calls a supplier directly. It feels faster, but it removes the budget check that protects the business in the first place.
The second is failing to number and file both documents together. When a purchase requisition and its resulting purchase order share no reference, reconciling invoices later becomes guesswork. Finance staff end up matching amounts by memory instead of by record.
The third is treating approval as a formality. If managers rubber-stamp every purchase requisition without checking it against budget, the process exists on paper only. The real control comes from someone actually reviewing the request before it becomes a binding commitment to a vendor.
Building a Process That Actually Works
A good procurement workflow does not need to be complicated. It needs a standard requisition form, a clear approval chain, and a purchase order that only gets generated once that chain is complete.
Start small. Set a spending threshold, for instance anything above ₦50,000, that requires formal approval before any order goes out to a vendor. Assign one person or a short chain of approvers so requests do not sit for weeks waiting on someone who travels often or works odd hours. Number every purchase requisition and purchase order so they can be matched later during reconciliation or an audit, and keep both on file even after the transaction closes.
Set a policy for what happens when plans change too. If a vendor’s price shifts after the formal order has already gone out, decide in advance whether that needs fresh approval or falls within an agreed tolerance. Businesses that skip this step often find themselves either paying more than budgeted without anyone noticing, or stuck in awkward renegotiations with a supplier who already has a signed commitment in hand.
Manual systems break down quickly as a business grows. A request scribbled in a notebook or buried in a WhatsApp chat is easy to lose, and easier still to forge. This is exactly the kind of gap that platforms like Salario are built to close, by giving businesses a single system where requests, approvals, and payment records live together with a clear audit trail from the first ask to the final payment.
Get Purchase Requisitions and Purchase Orders Under Control
A purchase requisition asks permission. A purchase order confirms a commitment. Keep the two separate, keep them documented, and you close two of the most common gaps that let money disappear from a growing Nigerian business.
Ready to give your finance team real visibility over spending and payroll? Book a free demo with Salario today and see how automated approval trails and audit-ready records keep your business protected, wherever you are running it from.
