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We report evidence for the b[yields] u transition B[sup 0][yields] D[sub s][sup+][pi][sup -] and the results of a search for B[sup 0][yields] D*[sub s][sup+][pi][sup -] from a sample of 61.6 x 10[sup 6][Upsilon](4S) decays into B meson pairs collected with the BABAR detector at the PEP II asymmetric e[sup+]e[sup -] collider. The observed B[sup 0][yields] D[sub s][sup+][pi][sup -] yield has a probability of 4.4 x 10[sup -4] to be a fluctuation of the background (3.5[sigma]) and we measure the branching fraction[Beta](B[sup 0][yields] D[sub s][sup+][pi][sup -])= (3.1[+-] 1.0(stat.)[+-] 1.0(syst.)) x 10[sup -5]. They also set a limit[Beta](B[sup 0][yields] D*[sub s][sup+][pi][sup -])