| Licence categories equated 1:1 | Foreign categories do not map cleanly onto the EU classes A/B/C/D; a false equivalence can cause the exchange application to be rejected. | Categories are carried over exactly as issued and explained with a translator's note, without claiming a Swiss category that was never granted. |
| Harmonised code numbers left out | EU code numbers (e.g. 01 corrective lenses, 78 automatic only) are legally relevant; omitting them leaves a condition undocumented. | Every code number and restriction is transferred in full, with its meaning explained. |
| Name transliteration ≠ passport | If the spelling differs from the passport, the Strassenverkehrsamt cannot reliably match the licence to the applicant. | Names are transliterated by the applicable rules and matched exactly to the passport spelling; any deviation is noted. |
| Issue and validity dates confused | A date format written as 03/04 is read differently abroad — a wrong expiry date makes the document unusable as evidence. | Dates and number formats are rendered unambiguously into the target format. |
| Authority & issuing state translated | The issuing body needs to stay traceable for the receiving authority; a "translated" agency name is not. | Proper names stay in the original, with an explanatory equivalent added in brackets. |
| Translation confused with the Art. 42 VZV proof | Driving in Switzerland on a non-EU licence requires the specific automobile-club translation under Art. 42 VZV — a different document is not accepted. | We clarify the purpose up front and point to the correct route for Art. 42 VZV instead of supplying an unsuitable document. |