I want to make the change order task read only.

[Gulfam]

I want to make the order field of "Change Task" read only. It should be editable only for "Assigned to" of "Change Request". 

[Amit Pandey]

Hi @Gulfam 

Please try following client script-

function onChangeAssignedTo() {
    var assignedTo = g_form.getValue('assigned_to'); 
    var changeRequestId = g_form.getValue('change_request');
    var changeRequestGr = new GlideRecord('change_request');
    changeRequestGr.get(changeRequestId);
    if (assignedTo === changeRequestGr.getValue('assigned_to')) {
        g_form.setReadOnly('order', false);
    } else {
        g_form.setReadOnly('order', true);
    }
}

Please mark my answer helpful and correct.

Regards,

Amit

[Gulfam]

Hi Amit, 

Thank you for quick response. 
This order field is related to change task. 

[Amit Pandey]

You can write above script on change task table only

[Gulfam]

Hi Amit, 

But the assigned to field is related to Change Request. Change task can be assign to any user. 
There is no such condition that assigned to on change task is the same person as assigned to on change request.