calculate field check box

[AnjaliY27945328]

on selecting a field on a form I am not able to check the value of the calculated field to true and am not able to write a script also 

any solution help and give suggestion

[Sanjay191]

Hello @AnjaliY27945328 
try to use below script to update and script logic should be
var grTable  = new GlideRecord("incident");
grTable.addQuery('sys_id',"sysID of the record");

grTable.query();

if(grTable.next()){

grTable.setValue('field backend name ',true)// i believe this field is boolean
grTable.update();
}

runs this background script.

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Thank You