Sorry, I forgot to mention this, but when the original part was exported as a solid, it wouldn't convert to a sheetmetal part in Pro/e. But, when it was exported as surfaces, it came into Pro/e and converted fine. If you have any of that kind of control over the export, try exporting it as iges surfaces.
Also, expecially on sheetmetal parts, with their very high ratio between part size and sheet thickness or small hole sizes, accuracy is a serious issue. Make sure any settings governing accuracy in the creating software are set high enough. A quick check of smallest feature to largest will tell how to set it. If that ratio is, say, 1:1000, set the accuracy to 1:1500, just to be on the safe side. Regenerate and re-export. This often fixes data integrity problems.
David Janes