EN
We study the preservation of the property of LR being a Solovay model under projective ccc forcing extensions. We compute the exact consistency strength of the generic absoluteness of LR under forcing with projective ccc partial orderings and, as an application, we build models in which Martin's Axiom holds for $Σ\limits_{∼}}^{1}_{n}$ partial orderings, but it fails for the $Σ\limits_{∼}^{1}_{n+1}$.