In this example the X,Y and Z axes are left unchanged. If you notice that your model gets flipped upside-down or rotated perhaps you need to try other combinations.

Set the Scaling factor to 100 or so. This will bring the imported poser model to about normal size for Amapi's workbench. And you won't have those holes appearing from dropped polygons. The scale you enter is used for importing by Amapi. The inverse of that value (e.g. 1/100 or 0.01) is used when re-exporting. This ensures that the data should still be usable where it came from, and typically that's what you want when making Morph targets.
 

The I/O 'Clean' flag should not be used. If you use it there's a chance that Amapi will convert some facets to different format (such as a quadrilateral that appears curved to two triangles). This flag is used when you are working with bad geometric data in the first place, such as self-intersecting polygons.

The I/O 'Smooth' flag is used for exporting with an associated crease angle in degrees (45 in this example). If you set it to zero the model appears flat shaded after exporting. But I think it won't affect the facet's topology as it shouldn't add or delete vertices. Only the vertex normals are affected (I think). The Smooth angle is thus a threshold (crease) angle. If facet normals of two neighboring facets have a different direction by an angle that's smaller  than the indicated threshold limit, then the vertex normals are set accordingly with a direction that points between the two facet's normal's directions. This results in smooth shaded appearance. If the angle between the facet normals is larger than the indicated angle, this would indicate that we want to consider that to be a 'real' sharp surface which will appear as flat shaded (creased).