Mercedes has been ordered to face the Singapore Grand Prix stewards after being accused of an "inaccurate self-scrutineering form".
The matter relates to Lewis Hamilton's earlier summons for an alleged breach of the FIA's International Sporting Code.
The seven-time F1 champion was cited for a violation of Appendix L, Chapter III of the Code, which relates to drivers' equipment.
In particular, this refers to helmets, flame-resistant clothing, frontal head restraint, safety belts, and most relevant of all, the wearing of jewellery.
Earlier this year, FIA president Mohammed Ben Sulayem ordered a clampdown on drivers' wearing jewellery during sessions across a grand prix weekend.
Hamilton initially set out on defying the FIA, with a battle against the regulation dragging on as the 37-year-old apparently had piercings he claimed could not be removed.
Eventually, Hamilton was forced to toe the line and is understood to have removed all his piercings.
For the final practice session at the Marina Bay Street Circuit, however, it is believed Hamilton wore a nose piercing, which is against the regulations.
On Mercedes' part, all teams have to declare via a self-scrutineering form, whether any items of jewellery are being worn by their drivers.
On this occasion, it is clear Mercedes did not declare the nose piercing, which is set to lead to a fine for both the driver and the team.
The team has since been fined, which you can read here.