If you try to invent your own syntax, you are starting on very wrong basis.
The required syntax is defined by the Numbers AppleScript's dictionary.
This one doesn't know what is a template.
This is why, in the link posted by badunit, I use an other scheme to create a new document.
I know that it's awful but it's the only one available at this time.
Yvan KOENIG (VALLAURIS, France) samedi 4 juin 2011 11:25:25
iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.7
Please : Search for questions similar to your own before submitting them to the community
To be the AW6 successor, iWork MUST integrate a TRUE DB, not a list organizer !