In brief: the direct answer
Why a public buyer invoice without the right contract or order reference is rejected, even when the data is valid. B2g contract references and order is best approached through reference as the matching key. For b2g contract references and order, the contract or order reference decides the outcome. For b2g contract references and order, the contract or order reference missing means rejection. For b2g contract references and order, the contract or order reference wrongly mapped means wrong meaning. This guide keeps returning to one check for b2g contract references and order: confirm the required reference with the buyer.
The route stage for b2g contract references and order is Route. At Route, the contract or order reference is what follows next. For b2g contract references and order, a Route decision cannot be repaired later. For b2g contract references and order, a Route decision cannot be repaired cheaply. Check the contract or order reference for b2g contract references and order before moving on.
The record at this stage
Follow the invoice as a record through b2g contract references and order. At Route, the record for b2g contract references and order carries the contract or order reference. Answer the contract or order reference for b2g contract references and order with evidence. Then the rest of b2g and public procurement becomes easier. Then the rest of b2g contract references and order becomes easier to check.
Describe the record before the system for b2g contract references and order. Systems change, but the contract or order reference for b2g contract references and order stays. Providers change, but the contract or order reference for b2g contract references and order stays. Formats change, but the contract or order reference for b2g contract references and order stays. For b2g contract references and order, ask what record a system produces. For b2g contract references and order, ask what record a system accepts. For b2g contract references and order, ask what status evidence it returns.
What the data must carry
The data that matters most for b2g contract references and order is the contract or order reference. That is not a slogan for b2g contract references and order. It is what the next b2g contract references and order check looks at. If the contract or order reference for b2g contract references and order is missing, expect rejection. If the contract or order reference for b2g contract references and order is ambiguous, expect rejection. If the contract or order reference for b2g contract references and order is wrongly formatted, expect rejection.
Check the contract or order reference as the receiver reads b2g contract references and order. For b2g contract references and order, screen correctness is not enough. For b2g contract references and order, file correctness is not enough. For b2g contract references and order, mapping correctness matters too. Use the mapping table for b2g contract references and order first. Use the receiver test for b2g contract references and order second. Use a sample invoice for b2g contract references and order third.
Validation and evidence
For b2g contract references and order, validation has three gates. B2g contract references and order structure comes first. B2g contract references and order business rules come second. B2g contract references and order receiver rules come third. Each b2g contract references and order gate has its own failure message.
A b2g contract references and order rejection should name its rule. A b2g contract references and order rejection should name its field. A b2g contract references and order rejection should name the value sent. A b2g contract references and order rejection should name the value expected. Without those facts, a b2g contract references and order rejection is a delay. Return a b2g contract references and order rejection with that request.
Evidence for b2g contract references and order is what remains afterwards. Keep the b2g contract references and order invoice as exchanged. Keep b2g contract references and order status messages with it. Keep any b2g contract references and order correction linked to it. An auditor for b2g contract references and order asks for that set.
Where it breaks, and the check to make first
The common b2g contract references and order break is simple. For b2g contract references and order, confirm the required reference with the buyer was skipped. For b2g contract references and order, the receiver found the problem. For b2g contract references and order, the sender must now correct it. For b2g contract references and order, the sender must resend it. For b2g contract references and order, the sender must explain it.
Illustration, with round numbers only, for b2g contract references and order: A seller sends 50 invoices for b2g contract references and order. 5 fail on the contract or order reference for b2g contract references and order. Checking the contract or order reference first for b2g contract references and order costs minutes. A b2g contract references and order receiver rejection costs days. Sometimes a b2g contract references and order rejection costs a payment cycle. That is why b2g contract references and order repeats one check: confirm the required reference with the buyer.
What to verify before acting
Before acting on b2g contract references and order, verify three things. First, jurisdiction and transaction for b2g contract references and order. First, buyer and country for b2g contract references and order. Second, European Commission: European legislation on eInvoicing for b2g contract references and order today. Third, the b2g contract references and order buyer requirement in writing.
A guide on b2g contract references and order organises those questions. A guide on b2g contract references and order cannot answer a specific transaction. This guide on b2g contract references and order gives general information only. This guide on b2g contract references and order is not advice for a specific invoice. For a specific invoice about b2g contract references and order, check European Commission: European legislation on eInvoicing. For a specific question about b2g contract references and order, ask a qualified adviser.
How this guide is layered
Every guide on this site is read through the same twelve layers, in the order that fits its topic: tax, accounting, lifecycle, evidence, direct intent, transaction, jurisdiction, obligation, data, format, network, validation. The layers are a reading method, not a claim about any single system.
Evidence basis: Primary sources named in the sources section, checked 2026-10-27; country guides are dated research routes, not mandate calendars. Scope: General educational information only; no individual legal, tax, accounting or compliance advice; jurisdiction and transaction specific checks remain with the reader.
Related guides
- B2G and public procurement explained: selling to a public buyer - Receiver obligations under Directive 2014/55/EU, standard invoices, profiles and the portals that receive them.
- B2G invoicing for small suppliers - A small seller route to a public buyer: portal, provider or network, chosen by volume and by buyer rule.
- B2G validation and rejection handling - Portal and profile validation, actionable rejection messages, and resubmission without duplicating the invoice.
Back to the pillar guide: B2G and public procurement explained: selling to a public buyer.
In this topic
- B2G and public procurement explained: selling to a public buyer
- B2G framework agreements and invoicing
- B2G go-live checklist for a first public buyer invoice
- B2G invoicing for small suppliers
- B2G payment terms and late payment
- B2G portals and submission rules
- B2G profiles and CIUS for public buyers
- B2G validation and rejection handling
- Directive 2014/55/EU in practice for a seller
- Public buyer receiver obligations, explained
Primary sources and further reading
These official resources support the standards and regulatory context. Check their current versions before implementation.
- European Commission: European legislation on eInvoicing - Directive 2014/55/EU and the European standard
- European Commission: eInvoicing in public procurement - Public procurement scope and receiver obligations