part_name is default property

HI

I am using concept HDL in cadence package 16.5,

when i tried to packaging a symbol it showing error under the property name of "part_name".  Because this property consist some special character.  once again i tried to packaging without any special character under the name of "part_name",  now packaging is done.

From that i assumed "Part_name" is  default property of the concept HDL.

please give your suggestion,  Is "Part_name" default property?