boolean issue

 From:  wimverbe
7195.1 
Hi,

I have a strange thing here: there is a symmetrical curve, and I want to make it a bit smaller on both sides, but with maintaining the curved edge. so I draw a 3 point curve on 1 side and mirror it to the other side.
the original curve booleans the object, but the mirrored one refuses.
what do I overlook here?

tnx
wim
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