NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded the rating of Aliansce Shopping Centers S.A.'s (Aliansce) private secured non-convertible debentures in the amount of BRL90 million to 'AA (bra)'. from 'AA-(bra)'. The rating for the secured debentures incorporates the company's solid business position, moderate capital structure, adequate liquidity, stable cash flow generation, and some asset concentration. The high quality of its shopping mall portfolio, as well as the collateral support i