Service Request - Help request with a form personalisation

SERVICE – Help on

I currently have a personalisation on the Task tab to alter the 'Owner' literal to be changed to be 'Group'.

How do I change the matching column heading on the Task table which lists all tasks for the SR?

The Personalisation I have done to change the literal on the actual task is as follows:

On the Form and Function  : CSXSRISR

Condition : WHEN-NEW-BLOCK-INSTANCE

Trigger Object : CREATE_TASK

Condition :

Processing Mode : Both

Action

Object Type :  ITEM

Target Object   CREATE_TASK.OWNER

Property Name : PROMPT TEXT

Value : Group

Any help gratefully received, Thank you  Viv