About Dirichle's rows whith finite-valued multiplicative coefficients, satisfy the Riman's type functional equation coefficients, satisfy the Riman's type functional equation

In this paper the class of absolutely convergent on the half-plane $\sigma>1$ Dirichlet series with multiplicative finite-valued coefficients is considered. We prove that only Dirichlet $L$-functions are solutions of a functional Riemann type equation.