Client Script for Child Table Mandatory base on workflow status

ERPNext
, ,
1

Hi,

I am doing script for our doctype where in the specific field from the child table will throw a mandatory error once the workflow status of the doctype is ‘For Checking’

I’ve tried doing this, but it’s not working

frappe.ui.form.on(‘Service Schedule’, {
refresh(frm) {

	 frappe.ui.form.on("Service Stops", 'distance', function(frm, cdt, cdn){
       if(frm.doc.workflow_state == ' For Checking'){
            frappe.throw({
                    title: __('Error'),
                    indicator: 'red',
                    message: __('Please input Distance')
                });
                validated = false;
        }
    });
}

})