Opinion of Mr Advocate General Léger delivered on 15 March 2001.

Gervais Larsy v Institut national d'assurances sociales pour travailleurs indépendants (INASTI). # Reference for a preliminary ruling: Cour du travail de Mons - Belgium. # Regulations (EEC) Nos 1408/71 and 1248/92 - Retirement pensions - Anti-overlapping rules - Unenforceability pursuant to a judgment of the Court of Justice - Limitation of effects - Serious breach of Community law. # Case C-118/00.