To speak out or remain silent – the importance of the Grossmann doctrine for suppliers

The recent ruling of the Supreme Administrative Court (KHO:2026:30, 6 May 2026) has highlighted the significance of the Grossmann doctrine for suppliers. The Grossmann doctrine is the European Court of Justice's principle that suppliers must promptly challenge errors in a procurement procedure, or risk losing their right to bring proceedings. The ruling has attracted particular interest in connection with a dynamic purchasing system, although its scope is considerably broader. Finnish case law from KHO 2017:12 to MAO:263/2025 shows that failure to act on known deficiencies precludes objections in open and selective procedures, and in framework agreements.

The doctrine is by now firmly established. What deserves attention is the strategic dimension: when a supplier discovers a defect in the tender documentation, what should it do? Raising an objection may jeopardise the relationship with a contracting authority the supplier wishes to work with for years to come. Remaining silent, however, risks forfeiting the right to challenge the award if the outcome later proves unsatisfactory. In practice, it is one of the most difficult recurring dilemmas in Finnish procurement law.

The Grossmann ruling

The European Court of Justice's 2004 judgment in Case C-230/02 Grossmann Air Service took a seemingly uncontroversial point of departure: the legal remedies in the Public Procurement Directives must be effective. The Court then added a counterbalance that has become the defining principle: the remedies must not be used to challenge, retrospectively, errors of which the supplier was aware, or ought to have been aware, at a significantly earlier stage of the procedure.

A supplier who identifies an error in the tender documents at an early stage, says nothing until the outcome is known, and only then challenges the error when the result proves unfavourable, is making selective use of the legal remedies. Later case law in Case C-328/17 Amt Azienda Trasporti e Mobilità SpA reinforced this line.

The core principle of the doctrine is that suppliers must respond promptly to any error that comes to light. Failure to do so means losing the right to initiate proceedings.

Grossmann in Finnish case law

Finland's procedural environment differs from Austria's. We have a dedicated Market Court, a Public Procurement Act (Act on Public Procurement and Concessions, 1397/2016) and relatively well-developed rules on appeal deadlines. We also have a strong administrative-law tradition in which the right to bring proceedings is typically exercised in two stages: first a complaint to the contracting authority, then, if necessary, an appeal. When the doctrine was incorporated into Finnish law, the debate centred on its formulation rather than its applicability.

KHO 2017:12 was an early Finnish landmark. The Supreme Administrative Court ruled that a supplier with an interest has the right to challenge an incorrect or discriminatory invitation to tender, even without having submitted a tender. On first reading, the judgment appears to extend the right of action. In practice, it also creates a duty to act: if a supplier can challenge the invitation to tender itself, it must also do so when the defect is apparent. A supplier who instead proceeds through the procedure, accepts the course of the award, and only objects once the contract has gone to someone else, has made, in legal terms, a deliberate choice — to keep the objection in reserve.

The Market Court has followed a consistent line since. In MAO:85/2023 and MAO:101/2023, the Court's reasoning aligns with Grossmann: suppliers must raise objections to defects in a timely manner in procurements under the Public Procurement Act, or the objection risks being precluded. MAO:61/2025 emphasises that known or reasonably foreseeable defects must be raised during the proceedings; those who fail to do so may lose on the merits and see their claim dismissed as precluded. MAO:315/2025 continues this line, focusing on the precise moment at which a defect is deemed to have become known.

KHO:2026:30 continues and tightens this line.

The strategic core

The legal analysis is only half the picture. The other half is the commercial assessment. For an experienced tender manager, the problem is rarely failing to spot the error. The cost lies in raising it.

When a supplier seeking the contract openly criticises the tender documentation – the requirements specification is discriminatory, the weightings are unreasonable, the competence requirements are tailored to a competitor, the quality criteria are vague – the other suppliers in the process gain information they did not previously have. Even soft factors such as goodwill, future contract extensions and voluntary dialogue during implementation can be affected, depending on how the supplier is perceived.

For many suppliers, silence is a rational choice. What matters is that the choice is made consciously, with full awareness of its implications.

An objection to specific points in the tender documentation forces the supplier, willingly or not, to reveal its own reading of those documents. The objection leaks information on several levels.

An objection to a technical weighting signals that the weighting is central to the supplier's tender strategy. An objection to a capacity threshold signals that the supplier is close to it. Criticism of how the reference requirements are formulated tells an attentive counterpart where the supplier lacks references.
The second dimension is what the objection reveals about the supplier's pricing and cost structure. This is most evident in objections to volume terms, pricing mechanisms, adjustment clauses or indexation. The structure of an objection's argument is rarely entirely separate from the economic logic of the supplier's own tender. An experienced counterparty can read an objection to a pricing formula and draw reasonable conclusions about where the supplier's marginal cost lies.

The objection may also reveal how the supplier sees its competitors. This third dimension is the most sensitive. When the supplier argues that certain requirements are tailored against a competitor, and explains why, the other participants effectively receive a competitive analysis.

There is a further problem: a successful objection may benefit competitors more than the supplier that raised it. Amending the tender documentation opens up competition. The clause considered discriminatory is rewritten. The weighting is rebalanced, the reference requirement is broadened, the field of eligible bidders is widened. If the supplier's competitive advantage rested on a superior reading of the original documents, that advantage is wiped out. The supplier has then paid for the improvement and welcomed new competition in the same move.

The conclusion is not that objections should be avoided as a matter of principle, but that they should be formulated with strategic care, so that any correction preserves rather than erases the supplier's position.
Silence may look like a free option, but in its current Finnish form the Grossmann doctrine puts a price on it. A supplier that discovers a defect and stays silent may secure a favourable position during the proceedings, but that silence also forfeits the right to object later if the outcome proves unsatisfactory.

Silence is itself a strategic position. In my professional view, the commercial cost of a well-considered objection is often lower than the preclusion risk that follows from silence.