Design Studio upgrade 3 to 9/javascript errors

We are upgrading to Design Studio 9 and I'm trying to alter the Design Studio customizations we had on AP20.1. I have downloaded the latest documentation from Lawson but didn't find a definitive list of Javascript changes. I'm putting one piece of Javascript into the form at a time and get an error on each piece. Here's where I'm starting so that pay vendor doesn't default to the prior invoice's pay vendor:

function FORM_OnBeforeTransaction(fc)
{
 if (fc=="A")
 {
   var vInfoVen=lawForm.setDataValue("API-PAY-VENDOR"," ");
   var vInfoName=lawForm.setDataValue("VEN-VENDOR-PNAME"," ");
   if (!vInfoVen || !vInfoName)
   return false;
 else
   return true;
 }
 return true;
}

I haven't been able to find any references in their documentation to "lawForm.setDataValue" so I don't know if that is the issue here? When I try to File, Save, the error says "Script is saved without syntax error checking. A script control component is not found. Please refer to the documentation for download instructions."

The rest of the Javascript in this form, I have found syntax changes. However, no matter which section I put into the form, I receive the same error. Has anyone else run into this? Thanks for any assistance!