For morphs, you'll want to export them with this feature: 

Sorry, I have no idea what that would be in german.

If you are exporting a morph as obj, the error might be from having Subdivision applied. This would export an OBJ with more vertices than the figure is looking for.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.