OK I found this article on the Autodesk site seems there is mention about using the Legacy boolean that this si something specific to Maya 2015 here is the link hope it helps

https://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Maya/files/GUID-9BEF1E7E-9727-4A88-B042-63D72550BC1E-htm.html

Lobo3433

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