  We revisit the SL(5) U-duality manifest action constructed by Berman and
Perry in an extended spacetime. Upon choosing a four-dimensional solution to
the section condition constraint, the theory reduces to a four-dimensional
truncation of eleven-dimensional supergravity. In this paper, we show that the
theory contains more than this M-theory reduction. The section condition also
admits an SL(5) inequivalent three-dimensional solution, upon which the action
directly reduces to a three-dimensional truncation of type IIB supergravity. We
also discuss the reduction to IIB$^*$ supergravity.
