The short answer
Tell Mia the project country, the required standard with part and edition, and the National Annex to be applied. Provide this basis directly in the request or in the designated input field of the skill. If the requirements are still open, clarify them before the calculation. The language of the chat does not determine the project country or the National Annex.
Formulate the basis clearly
For example, you can write: My project is located in Germany. Before the calculation, list the required parts of the Eurocode, their editions, and the relevant National Annexes. Clarify with me which of these apply to this assignment.
This is a template for clarification, not a specification of a particular edition of a standard. Which rules apply to your project depends on the project requirements and the relevant regulations.
Check the sources used
For standard-dependent coefficients and limit values, ask for the specific reference with section or table. Check whether standard part, edition, amendments, and National Annex match and whether the scope of application covers your task.
A section heading or a search result alone does not confirm the correctness of a coefficient. If a required source is not available or a statement is unclear, this must remain visible in the result.
Record the basis when changes are made
If you change the country, standard edition, or National Annex, ask for a renewed review of the affected inputs and verifications. In RFEM, additionally check the actual settings in the model. A statement in the chat alone does not prove a change in the RFEM settings.