Error when creating CASH SALE via RESTLET

I have created RESTlet that will accept a series of SALES ORDER internal ids and from them create CASH SALES using nlapiTransformRecord to go from SALES ORDER to CASH SALE (code at below message).

In testing my RESTLET I receive the following error message:

{      "error": {      "code": "USER_ERROR",      "message": "You must enter at least one line item for this transaction."      }  }

However when I go into NetSuite the system created the CASH SALE based on the given SALES ORDER with all the appropriate items.

Additionally, when I view the CASH SALE that was created it listing the items in the item list as BACKORDERED when there is clearly enough inventory.