In this paper, using a model of N=2 supergravity--vector multiplets interaction with the scalar field geometry as an example, we show that even when the geometry is fixed, one can have a whole family of Lagrangians that differ by the vector field duality transformations. As a byproduct, we have constructed for this geometry a model of (m-1) vector multiplets interacting with the hidden sector admitting spontaneous supersymmetry breaking with two arbitrary scales and without a cosmological term.