RESTlet Error Creating a Sales Order

I am attempting to create a sales order using a RESTlet.

I am passing in information similar to the example listed in the help files.

The script I am using is:function createRecord(datain)
{
    var err = new Object();
  
    // Validate if mandatory record type is set in the request
    if (!datain.recordtype)
    {
        err.status = "failed";
        err.message= "missing recordtype";
        return err;
    }
  
    var record = nlapiCreateRecord(datain.recordtype);
  
    for (var fieldname in datain)
    {
     if (datain.hasOwnProperty(fieldname))
     {
         if (fieldname != 'recordtype' && fieldname != 'id')
         {
             var value = datain[fieldname];
             if (value && typeof value != 'object') // ignore other type of parameters
             {
                 record.setFieldValue(fieldname, value);
nlapiLogExecution('DEBUG','fieldname='+fieldname);