A former client relations and collections manager testified that Dewey & LeBoeuf’s former leaders instructed partners to ask clients in January 2010 to backdate checks for matters to the previous month so the struggling 1,400-lawyer firm could book them as 2009 collections.

The witness, Suzanna Sanchez, a then 27-year-old staffer in charge of collections at the now-defunct firm, was questioned Tuesday afternoon by New York prosecutors in the criminal fraud trial of former Dewey & LeBoeuf chair Steven Davis, former executive director Stephen DiCarmine and ex-CFO Joel Sanders.