can I have problems if my answer to the questionnaire is incorrect

An incorrect answer can come back to haunt you with the customer

Yes, it can — especially if the answer is used somewhere else than just in that one questionnaire. A customer often processes the answers in its own reporting, risk assessment or supplier assessment. If it states, for example, that the company is ISO/IEC 27001-certified and that turns out not to be the case, it affects not only the answer itself, but also everything the customer has based on it. For a customer subject to CSRD obligations that reports in accordance with Directive (EU) 2022/2464, supplied chain data sometimes appear in their own annual report.

The risk therefore lies less in the filling out itself, and more in its use afterwards. A blank answer or "not applicable" with a brief explanation is easier for most customers to process than a completed answer that is incorrect. This is particularly true for questions about the number of employees, turnover or countries of operation — figures that appear in multiple questionnaires and where discrepancies between portals stand out. See also how many employees does the company have and in which countries does the company have operations for how these two frequently recurring figures are precisely requested.

Where this follows from the nature of the questionnaire itself

This does not follow from one specific legal article about the questionnaire itself — it usually is not subject to a separate reporting obligation — but from the source to which the question refers. If the list asks for the ten measures of Article 21(2) of the NIS2 Directive (Directive (EU) 2022/2555), that is a reference to a legal standard; an incorrect answer on this is separate from the questionnaire, but not separate from that standard. If the list asks for sustainability data in accordance with the EFRAG VSME standard, the weight of an error lies more in what the customer does with it than in a sanction on the answer itself. Basic data such as the registration number can be verified against the Trade Register (Trade Register Act 2007), and differences there are easiest to trace back to a simple error.