An invoice without a purchase order number needs an initial check: does a PO exist with a missing reference, or was the purchase made without one? Search by vendor, project, and billed lines. If no PO is found, gather the purchase request, agreed pricing, and receipt or service evidence, then document an authorized decision under your process. Receiving an invoice alone does not establish that the purchase was approved or that the charge matches.
1. Separate a missing number from a missing purchase order
An invoice can arrive without a PO number even when purchasing issued a valid order. Compare the vendor, project, item description, quantity, and period with existing orders and documents. A similar total or the same vendor is not enough to establish a link; several orders may serve the same jobsite.
If your search finds no source, record that a PO has not yet been located, rather than that none definitely exists. Ask the requester or vendor for a specific reference. Different invoice lines may also have different evidence, so investigate at line level.
Microsoft describes both a PO-number route and a route without that number in Dynamics 365. This distinction helps frame the investigation; it does not establish that Novapro offers the same workflow or permissions.
Further reading: Microsoft Learn — vendor invoices with and without a PO
2. Choose the appropriate investigation route
This table is a suggested worksheet for purchasing and finance teams. It identifies missing evidence rather than granting payment approval. Your organization determines the approver, PO requirements, and exception process.
| Finding | What to verify | Next handoff |
|---|---|---|
| PO exists; reference is missing | Vendor, project, line, quantity, and current version against receipt evidence | Record the verified reference and continue document matching |
| No PO located | Requester, pricing basis, receipt or service evidence, and any documented approval | Route missing evidence and actual dates to the authorized decision maker |
| Mixed invoice | Which lines have PO support and which need separate investigation | Keep one original invoice with line-level records without duplicating the charge |
3. Example: ten panels, an eight-panel PO, and freight
Fictional illustration only: a jobsite has recorded receipt of ten panels. The invoice bills ten panels plus freight, without a PO number. A search finds an approved order for eight panels of the same specification for the same project. Receipt of ten panels supports what was recorded as arriving, but does not by itself explain who authorized two additional units or freight.
Allocate eight panels to comparison with the PO, two units to investigation of the purchasing basis, and freight to a check of the agreed terms. The eight units still require pricing and document checks; finding a PO does not itself approve them for payment. All three investigation groups remain linked to the same original invoice.
If a valid change request is later found, attach it with its original date and the date it was located. If approval is given only now, record the actual decision date. Do not alter dates to create the appearance of earlier approval or create another PO solely to make a matching result look complete.
4. Hand off a short, decision-ready record
Copy this structure into your internal record: invoice number and vendor; project and requester; line and quantity; PO found or search still open; pricing source; receipt document or service evidence; existing approval and date; missing information; investigation owner; follow-up date; decision and supporting reference. Keep unknown fields explicitly marked as missing.
For a service, describe what was requested, what was performed, and who verifies that record; do not invent a goods delivery note to fill a gap. Also check whether the invoice has already been recorded or routed for investigation, so a vendor resend does not become another billing workflow.
SAP describes a non-PO invoice for a received product or service without an associated PO, with submission for approval. This supports the terminology rather than requiring your organization to accept such invoices or describing a Novapro feature.
Further reading: SAP Help — Creating a Simple Non-PO Invoice
5. Connect the investigation to project documents
When a suitable PO is located, continue comparing the order, receipt, and invoice. If evidence remains missing, keep an owner and next step visible instead of marking the match complete. Receipt evidence, purchase authorization, and a finance decision are separate records.
Novapro presents purchasing and document-matching workflows in project context. Bring a scenario without sensitive information to a demonstration to examine that document sequence. A dedicated non-PO approval route, retrospective PO creation, or payment execution is not promised by this guide; assess each requirement separately.
Practical checklist
- Check whether a suitable PO exists rather than only noting a missing number
- Verify the vendor, project, lines, and current version
- Separate receipt evidence, agreed pricing, and purchase approval
- Preserve source dates and the actual decision date
- Assign an investigation owner and follow-up date
- Check that the invoice is not already in another processing route
Prepare an example without sensitive information: what was billed, which order was found, and what the jobsite recorded. Explore the purchasing and document sequence and identify requirements that need further assessment.
Request a document workflow demoFrequently asked questions
Does a missing PO number always mean the purchase was unauthorized?
No. A PO may exist with only its reference missing. Locate it and verify the lines and project. If the search is incomplete, record that the order has not been located rather than concluding that no approval existed.
Can a delivery note replace a purchase order?
A delivery note or receipt record supports an investigation of what arrived. It does not alone establish who authorized the purchase, the agreed price, or who may approve the charge. Check those evidence sources separately.
What if only part of the invoice has a matching PO?
Keep the original invoice and investigate at line level. Identify verified references, missing evidence, and its owner. This does not itself authorize partial payment or justify creating another billing copy.
Keep reading
Three-Way Matching: Purchase Orders, Delivery Tickets and Invoices →
Duplicate Supplier Invoice? How to Review a Suspected Repeat Charge →
Invoice Before Goods: What Receiving Evidence Is Still Missing? →