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```var tranid = request.getParameter('transaction');
if(tranid) {
  var type = nlapiLookupField('transaction', tranid, 'type');
  if(type &amp;&amp; type === 'SalesOrd') {
     // Your code here
  }
}```

I managed to solve it with document.getElementById(‘transaction’).value and then nlapiLookupField.  A bit kludgey but it worked…

Weird, didn't `request.getParameter('transaction')` work? I am using that in a script succesfully