Creating Inventory Adjustments: Add a line item

I am doing some exploratory work on whether or not we can automate some inventory transfers for a demo program that we have.  I am trying to create an Inventory Adjustment record that subtracts inventory from one warehouse and adds it to another.  Everything seems to work just fine in how the nlobjRecord is manipulated, but when I submit it I keep getting the following error:

UNEXPECTED_ERROR: You must enter at least one line item for this transaction.

The code that generates this error follows:

function testAdjCreate()  {   try   {    var existing = nlapiLoadRecord("inventoryadjustment", "67071");    var xfer = nlapiCreateRecord("inventoryadjustment");    xfer.setFieldValue("account", "305");    xfer.setFieldValue("adjlocation", "4");    xfer.setFieldValue("haslines", "T");    xfer.setLineItemValue("inventory", "item", 1, 768);    xfer.setLineItemValue("inventory", "location", 1, 5);    xfer.setLineItemValue("inventory", "adjustqtyby", 1, 5);    xfer.setLineItemValue("inventory", "item", 2, 768);    xfer.setLineItemValue("inventory", "location", 2, 4);    xfer.setLineItemValue("inventory", "adjustqtyby", 2, -5);    var count = xfer.getLineItemCount("inventory");    var id = nlapiSubmitRecord(xfer, true);   } catch (err) {     alert (err.getCode() + ":n" + err.getDetails());     }  }