SuiteGL Access to Form Name ?

I have written a suitegl script. The script is executed all the time which is fine but I need to do some specific "manipulation" based on the form name .
I put this code
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  var createdfrom = transactionRecord.getFieldValue('createdfrom');
  nlapiLogExecution('AUDIT', 'Step 1 - createdfrom=', createdfrom);

  var customform1 = nlapiGetFieldValue('customform');
  nlapiLogExecution('AUDIT', 'Step 2 - customform1=', customform1);

  var customform2 = transactionRecord.getFieldValue('createdfrom');
  nlapiLogExecution('AUDIT', 'Step 3 - customform2=', customform2);
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and none return the form name. Is it possible to get the form name in Suite GL ?

Thanks
Real