Multiple radius curved sheet metal

Although I've used SolidWorks for several years, I've neverhad to do sheetmetal parts beyond the occassional simpleL-brackets. I'm trying to make a curved skin that has two differentradii along the edge that are tangent. I've read the post 'CurvedMetal Sheet Part' posted by John Scott and was able to follow thatto get the part made. However, the example uses a single arc forthe base flange. When I try to flatten mine, SW gives me an errorsaying that the part contains features that cannot be unbent. CanSW2009 unbend multiple radii in this manner? And if so, what am Idoing wrong?SolidworksSheet Metal