prevent a record from saving on suite script with 2.x

AI generated answer (using internal Slack threads):

To prevent a record from saving in SuiteScript 2.x, you can use a User Event Script and throw an error in the beforeSubmit function. This function is triggered before the record is saved, and by throwing an error, you can prevent the record from being saved. Here is a simple example of how you can do this:

javascript
/**
 * @NApiVersion 2.x
 * @NScriptType UserEventScript
 */
define(['N/record', 'N/search'], function(record, search) {
   function beforeSubmit(context) {
      if (context.type !== context.UserEventType.CREATE && context.type !== context.UserEventType.EDIT) {
         return;
      }

      var newRecord = context.newRecord;
      var customFieldValue = newRecord.getValue('customfield');

      var duplicateCheck = search.create({
         type: "customrecord_myrecord",
         filters: [
            ["custrecord_myfield", "is", customFieldValue]
         ]
      }).run().getRange(0, 1);

      if (duplicateCheck.length > 0) {
         throw {
            name: 'DUPLICATE_RECORD',
            message: 'A record with this custom field value already exists.'
         };
      }
   }

   return {
      beforeSubmit: beforeSubmit
   };
});

In this script, we are checking if a record with the same custom field value already exists. If it does, we throw an error and prevent the record from being saved. Please replace "customfield", "customrecord_myrecord", and "custrecord_myfield" with your actual field and record IDs. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******