For at sikre overholdelsen af proportionalitetsprincippet og af hensyn til at forbedre erhvervsmobiliteten i Unionen bør den kontrol, der udføres af eller under tilsyn af en kompetent myndighed, begrænses til kendskab til et officielt sprog i værtsmedlemsstaten eller et administrativt sprog i værtsmedlemsstaten, forudsat at det administrative sprog også er et af Unionens officielle sprog.
In order to ensure respect of the principle of proportionality, and in the interests of enhancing the mobility of professionals in the Union, the controls carried out by, or under the supervision of, a competent authority should be limited to the knowledge of one official language of the host Member State, or one administrative language of the host Member State, provided that it is also an official language of the Union.