Originally Posted by
RWY02KTM
How does the Schengen rules work ? In case of USA, I just carry both the passports. The Schengen visa was issued by German Embassy and on this trip i may either enter Schengen via FRA or ARN.
No problem provided the physical Schengen visa sticker is not damaged or defaced in anyway. It remains valid in conjunction with a valid passport until its originally endorsed expiry date.