The decree of 31 March 1492 ordered a permanent exclusion, and no repealing act is catalogued in this atlas. That a formal revocation took place in the twentieth century is very widely repeated in general accounts, and none of them that the atlas has been able to check cites the repealing instrument. Spain has acted concretely to reverse the decree's effects, most recently through Ley 12/2015, which offered Spanish nationality to Sephardim of Spanish origin and frames itself in its preamble as a redress of the expulsion, but that law does not purport to repeal the decree and does not refer to any earlier act that did.
What would resolve this A citation to the Boletin Oficial del Estado, or to a scholarly account working from it, identifying the repealing instrument, its date and its scope. A negative finding would be equally useful: if the decree was left standing and simply became inoperative, that is a fact about how spent instruments die and belongs in the record.
OpenSpanish legal history; Sephardic studies; archival research in the Boletin Oficial del EstadoCortes Generales de Espana, Ley 12/2015, de 24 de junio, en materia de concesion de la nacionalidad espanola a los sefardies originarios de Espana