International Project - Signage issues

Our project has been denied this credit because we do not use the exact verbage required for the signage. Our project is in Sweden and parking signage is required to use traffic regulatory approved signage from the municipality. This signage specifies (when translated) to green car. As using signage "low-emitting and fuel-efficient" vehicles is not really applicable in Sweden as "green car" innately means LE/FE. These parking spaces for 'green cars' follow European emission standards that don't follow the ACEEE guidelines. Have other European projects encountered similar issues? How have you proved that these parking spots are still compliant? We are thinking of conducting a comparison of ACEEE and Swedish legislation (aka what it means to be a green car in sweden) to prove compliance, but this will be alot of work.