‘New’ button hide for change task

[Lili12]

Hallo, 

I want to be able to create a change task with the ‘New’ button, but only if the (parent) change has the status ‘New’, ‘Assess’, ‘Authorise’, ‘Scheduled’ and ‘Implement’.
Displaying it worked via List Control.
Do you have any idea how I can hide the ‘New’ button on the change task? So if the (Parent)Change has the status ‘Review’, ‘Closed’ or ‘Canceled’ the ‘New’ button has to be hidden in the change task

Thanks

[Ankur Bawiskar]

@Lili12 

Steps

1) right click on related list Configure -> List Control

2) Use Omit new condition script field (if this field is not on form then add it on form)

3) script to be added in that script field

if (parent.state.toString() == '0' || parent.state.toString() == '3' || parent.state.toString() == '4')
    answer = true; // omit when closed, cancelled or review
else
    answer = !parent.active; // show only if CHG is active

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