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If someone who has 2015 installed already could check: has ASME Y14.5-2009 been added to the standards?
I cannot comment as to why this has not been incorporated. You did the correct thing and posted this here.
http://forums.autodesk.com/t5/Inventor-IdeaStation/Add-ASME-Y14-5-2009-as-an-option/idi-p/3854667
The developers can be made aware of this via this channel.
Regards,
Don