The Decree Law No. 446/85, of 25th October, establishes the legal regime of General Contract Clauses.
Document caption Decree-Law No. 446/85, of 25th October 1985 Image extracted from DRE/ Diário da República nº 246/1985, Série I de 1985-10-25, Ministério da Justiça, pages 3533-3538 https://dre.pt/application/conteudo/177869