A senior vice president for Wachovia Bank’s legal banking client business testified Wednesday about the bank’s deteriorating relationship with Dewey & LeBoeuf as the firm was buffeted by the financial crisis and unrealistic compensation demands by its legacy partners.

The witness, Robert Tolan, a senior vice president at Wachovia and later Wells Fargo Bank N.A. after Wachovia’s acquisition, is the sixth Dewey banker to testify at the criminal trial of three former Dewey & LeBoeuf executives.