  We investigate two types of transformations that keep NS-NS Generalized
Supergravity Equations satisfied : $\chi$-symmetry that shifts dilaton and
gauge transformations that change both dilaton and vector field $J$. Due to
these symmetries there is a large set of dilatons and vector fields $J$ that
(for a fixed metric and B-field) satisfy Generalized Supergravity Equations but
only some of them can be be used as input for Poisson--Lie transformations.
Conditions that define the admissible dilatons are given and examples are
presented.
