@jonny commented on @nzaleski’s file https://netsuiteprofessionals.slack.com/files/U4G3WARJL/F7GSLB1E1/kdl_rateRequest_js.js: If you want to include a custom module you can include the include the relative path of the file in the definition array, not just the name of it. So try using

'./x2js'

in your definition array (assuming the file is in the same location as the suitelet file).