Creo 2.0 ToolKit ProFitGlobalinterferenceCompute

extern ProError ProFitGlobalinterferenceCompute(

    ProAssembly assem,

    ProFitComputeSetup comp_setup,

    ProBoolean set_facets,

    ProBoolean set_quilts,

    ProBoolean fast_calculation,

    ProInterferenceInfo **interf_info

    );

when the Arguments fast_calculation = PRO_TRUE, The function in Creo 2.0 M100 return PRO_TK_BAD_INPUT

but in Creo M050 is PRO_TK_NO_ERROR! why?