What Is a Purchase Requisition?
A purchase requisition is created when an employee or department identifies a business requirement. It normally includes the requested item or service, quantity, estimated cost, required date, business purpose, department, cost center, project, and supporting documentation.
Purchase Requisition Creation establishes the initial record that procurement and finance can review. Approval rules may route the request to a manager, budget owner, procurement professional, or finance reviewer depending on the amount, category, entity, or organizational policy.
The requisition therefore represents a request for authorization rather than a supplier commitment. It can be modified, approved, rejected, or routed for sourcing before a purchasing document is issued.
What Is a Purchase Order?
A purchase order is a formal purchasing document issued by an organization to a supplier after the required approvals and purchasing decisions have been completed. It generally specifies the products or services, quantities, prices, delivery requirements, payment terms, supplier information, and other agreed conditions.
Once authorized and communicated to the supplier, the purchase order provides a reference for receiving and invoice validation. An Automated Purchase Order Management System can connect requisition approvals with purchase order creation, status management, and downstream procure-to-pay activities.
The purchase order therefore represents an external purchasing commitment, whereas the requisition primarily represents the organization's internal request and authorization process.
Purchase Requisition vs Purchase Order: Key Differences
- Purpose: A requisition requests approval to purchase; a purchase order communicates an approved order to a supplier.
- Origin: A requisition is generally created by an employee or department; a purchase order is typically issued by procurement or an authorized purchasing function.
- Timing: The requisition normally precedes supplier ordering, while the purchase order follows approval and purchasing decisions.
- Audience: Requisitions primarily serve internal stakeholders; purchase orders are issued to suppliers and referenced by internal teams.
- Financial role: Requisitions support planned-spend authorization, while purchase orders document an approved purchasing commitment.
How the Two Documents Work Together
The two documents form a connected workflow rather than competing alternatives. A requester identifies a need and submits the requisition. Approvers review the requirement, budget, and purchasing policy. Procurement can then evaluate suppliers, negotiate applicable terms, and create the purchase order.
This sequence gives procurement teams a clear control point before an external commitment is made. Purchase Requisition Tracking can provide visibility into pending approvals, approved requests, sourcing activity, and conversion into purchase orders.
A Purchase Order Vendor Portal can further support supplier-facing coordination by providing access to relevant order information and helping connect supplier interactions with the purchasing workflow.
Connection to Invoice Processing and Accounts Payable
After goods or services are received, the purchase order becomes an important reference for invoice validation. invoice processing can compare invoice details with purchasing and receiving information before coding, approval, and posting.
For a deeper view of invoice workflow performance, Invoice Processing in 2025: Benchmarks, Bottlenecks, Fixes examines activities such as capture, extraction, validation, matching, GL coding, approval, and posting.
When the invoice is approved, AP Automation Software can connect invoice processing with payment planning, helping finance teams maintain a controlled flow from approved purchasing commitments to accounts payable settlement.
Payments, Suppliers, and Financial Controls
The requisition-to-purchase-order relationship also supports downstream financial decisions. Once an approved purchase results in an invoice, payments can be scheduled according to invoice approval, payment terms, cash requirements, and organizational controls.
Supplier information should remain consistent throughout this lifecycle. vendor management can help maintain supplier records and provide procurement and finance teams with relevant context when reviewing purchasing activity, invoices, and supplier transactions.
A clear separation between requisition approval and purchase order issuance also strengthens segregation of duties. The person requesting a purchase does not necessarily need authority to approve it or issue the supplier-facing order.
Best Practices for Managing the Requisition-to-PO Cycle
Organizations should define mandatory requisition fields, approval thresholds, purchasing authorities, and rules for converting approved requests into purchase orders. Standard categories and accounting information help procurement and finance teams evaluate requests consistently.
It is also useful to maintain a clear audit trail from the original request through approval, sourcing, purchase order creation, receipt, invoice validation, and payment. This creates a continuous evidence chain for spend visibility and financial reporting.
Finally, teams should measure how effectively requests progress through the workflow by monitoring approval turnaround, purchase order conversion, outstanding requests, and the relationship between approved purchasing commitments and subsequent invoices.
Summary
The difference between a purchase requisition and a purchase order is primarily their purpose and position in the purchasing lifecycle. A requisition captures and seeks approval for an internal purchasing need, while a purchase order communicates an authorized commitment to a supplier. Keeping both stages connected supports procurement control, spend visibility, supplier coordination, and efficient downstream financial processing.