How to create an import feature whose surface is ruled surface?

Hi All,

I would like to create import feature by ProImportfeatCreate, and the feature is a ruled surface. The interface type should be PRO_INTF_NEUTRAL, not from file. Is there anyone have experience?

I tried to construct two curves and two lines, initiate the surface shape by ProRulsrfdataInit, and assign contour for the surface data. All functions works well, except API ProImportfeatCreate returns -1.