  The dualised formulation of the symmetric space sigma model is peformed for a
general scalar coset G/K where G is a maximally non-compact group and K is it's
maximal compact subgroup.By using the twisted self-duality condition the
general form of the first-order equations are obtained.The results are applied
to the example of SL(2,R)/SO(2) scalar manifold of the IIB supergravity.
