Assign timebill to a project task

Using advanced project and trying to assign timebill record to a project task using server side after submit.  The task status is "in progress" and my timebill record is good but I get "invalid casetaskevent reference for customer" error.

The ids appear valid.  Below I copy fields from and existing timebill entered thru UI  but get same result when adding new record.  Look like a bug and I am hoping for a workaround suggestion. 

Ultimately I am trying to effect the overall project end date calculated thru sequence of required tasks.

 function testOnAfterSubmitRecord(type) {        var r = nlapiLoadRecord('timebill','536');      nlapiSubmitRecord(r); // <-- this works, can load and save        var nr = nlapiCreateRecord('timebill');      nr.setFieldValue('casetaskevent',r.getFieldValue('casetaskevent'));      nr.setFieldValue('customer',r.getFieldValue('customer'));      nr.setFieldValue('employee',r.getFieldValue('employee'));      nr.setFieldValue('hours',r.getFieldValue('hours'));      nr.setFieldValue('isbillable',r.getFieldValue('isbillable'));      nr.setFieldValue('serviceitem',r.getFieldValue('serviceitem'));      nr.setFieldValue('item',r.getFieldValue('item'));      nr.setFieldValue('location',r.getFieldValue('location'));      nr.setFieldValue('trandate',r.getFieldValue('trandate'));        // stuff added to no good effect      nr.setFieldValue('isadvancedjob',r.getFieldValue('isadvancedjob'));      nr.setFieldValue('isexempt',r.getFieldValue('isexempt'));      nr.setFieldValue('isproductive',r.getFieldValue('isproductive'));      nr.setFieldValue('isutilized',r.getFieldValue('isutilized'));      nr.setFieldValue('overriderate',r.getFieldValue('overriderate'));      nr.setFieldValue('projecttaskassignment',r.getFieldValue('projecttaskassignment'));      nr.setFieldValue('subsidiary',r.getFieldValue('subsidiary'));      nr.setFieldValue('customersub',r.getFieldValue('customersub'));      nr.setFieldValue('employeesub',r.getFieldValue('employeesub'));      nr.setFieldValue('customform',r.getFieldValue('customform'));      nr.setFieldValue('istimebillablebydefault',r.getFieldValue('istimebillablebydefault'));      nr.setFieldValue('origcustomer',r.getFieldValue('origcustomer'));      nr.setFieldValue('type',r.getFieldValue('type'));            nlapiSubmitRecord(nr); // <-- this fails, complains casetaskevent invalid for customer  }