Domstolen fastslog, at bestemmelserne i forordning nr. 3 og 4 ikke udelukker, at institutionen i en medlemsstat ved beregningen af det »teoretiske« beløb, som den ydelsesberettigede ville have haft ret til, såfremt alle forsikringsperioder udelukkende havde været til bagelagt efter denne medlemsstats lovgivning, anvender en regel i sin egen lovgivning og nedsætter det teoretiske beløb på grund af en ydelse, som den pågældende oppebærer fra en kilde uden for Fællesskabet1).
The Court held that the provisions of Regulations Nos 3 and 4 do not preclude the application by the institution of a Member State, when cal culating for accounting purposes the amount of the benefit to which the person concerned would be entitled if all the insurance periods had been completed exclusively under the legislation of that Member State, of a rule laid down under its own legislation in order to reduce the theoretical amount by the amount of a benefit received by the person concerned from a source outside the Community.*