Term net name changing for the pins automation using SKILL code

Hello,

I am on Virtuoso IC6.1.7 
I want to change by SKILL code the pins net names for a certain block.

I use in my code something like :

[..]  term->net->name = "new_value" 

and I get an dbSetq error (DB-370034) 

N.B. term~>name I can change with no problem, but it does not help me.

Somehow this property value cannot is read-only. How can it be changed automatically?
Can anyone tell help me on this one?

Thank you,
BR,

Odin