There's basically 3 types of Poser morph errors

Wrong Vertex Order: results in explosion, no notification. You could try attempt vertex order correction during second try import or use a correction script like odf's.

Wrong Number of Vertices: you won't even get past the notification. No result will load because of the mismatch

Loss of Polygroups: This is specific to figures, there is no pop up. Result will be a dead FBM dial with no dependencies present.