If you create a right hand version of a left hand sheet metal part by mirroring the part in an assembly, the mirrored part cannot be unfolded.

I usually get around this by creating left and right hand configurations. However this is not ideal from a file management point of view. In addition, if you add corner reliefs etc. on the flat pattern, they won't always carry across properly to the mirrored part.

Just wondering if anyone has any better techniques - I'm sure I'm not the only one who has run into this problem....

Thanks in advance!