By default, a built-in Script (ObjectEvents_CreditBureauDefaults_Events) will be used to determine the Defaults to be uploaded.
Customisation is optional - however to utilise the option to flag accounts as "In Legal" and send the whole balance as the defaulted amount, you will need to import the script and set the constants.
You can read more about this change here: Knowledge Base Article : Credit Bureau Defaults: new "In Legal" option added.
Now configure finPOWER Connect to use this Script. From Global Settings, Accounts, Scripts, Event, specify the "CreditBureauDefaults" Script as the code you have named the Script.