Create Fulfillment Packages with Server script

I'm trying to create packages with Server SuiteScript... it's not looking good.  Anyone done this or know if it's even possible?

Quickly I tried:

function OnBeforeSubmit(type)  {   var currentRecord = nlapiGetNewRecord();   if(currentRecord == null)   {    nlapiLogExecution ('DEBUG', 'Failed to get handle to record');    return;   }      //  try and get a package item count   var lineCount = currentRecord.getLineItemCount('packages');   //  also tried 'package'   if(lineCount != null)   {    nlapiLogExecution('DEBUG', 'There are ' + lineCount + ' packages');   }   else   {    nlapiLogExecution('DEBUG', 'Error getting package count');    return;   }       return;  }

However this returns -1 as the count for the packages (not surprised, I was just taking guesses on how to get to this data)