Unable to fetch Sla displayvalue/sysid in business rule

[Siddharth Parna]

Hello ServiceNow Community

I am trying to write business rule to create new Task sla when Assigned to changes.

As per the below script new Task sla is being created,but the new sla Defnition is showing blank.

I tried hardcoding newSLA.sla value to 'Sys_id' and it worked.I see that sla of initial task sla is not being retreived.I am trying to retreive through .getValue('sla') 

Could the community please suggest where would the correction be needed.

Thanks in Advance

(function executeRule(current, previous /*null when async*/) {

    // check if assignee has changed

    if(current.assigned_to!=previous.assigned_to){

        //check if task already has a Task SLA

        var slaGR = new GlideRecord('task_sla');

        var slaDisplay = slaGR.getDisplayValue('sla');

        slaGR.addQuery('task', current.sys_id);

        //slaGR.addQuery('task', slaGR.getValue('sla'));

        slaGR.query();

    if(slaGR.hasNext()){

        //create a new Task SLA

        var newSLA = new GlideRecord('task_sla');

        var slasysid = slaGR.getValue('sla');

        newSLA.initialize();

        newSLA.task = current.sys_id;

        newSLA.sla = slasysid;

        newSLA.start_time = new GlideDateTime();

        newSLA.stage = 'In Progress';

        //newSLA.

        newSLA.insert();

    }

    }

})(current, previous);

[Ankur Bawiskar]

@Siddharth Parna 

why are you creating task_sla via script?

You can configure SLA Definition with correct start condition and system will associate that SLA with your record.

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Siddharth Parna]

Hi Ankur 

I am writing this script to create new task sla record whenver Assignee changes.New task sla is getting created but I dont sla defniton being popped up