On which modules do Duplicate Prevention not work?

Listed below are some features that don’t handle duplicate records:

• Import Data
  • The unique field selected in Module Layouts & Fields > Duplicate Prevention does not affect the import process. 
  • A user must choose the fields manually in the Import Duplicate Handling step while importing data to the CRM.
• Workflows
  • Update Field actions in Workflows do not check for fields enabled in Module Layouts & Fields > Duplicate Prevention.
• Schedulers
  • The working of Schedulers does not check for duplicate records.

Other features like Recurring Invoices, Subscriptions - Invoice Generator, MailScanner, etc. that update or create records will prevent the creation of duplicate records but do not notify the user.

To know more about Duplicate Prevention, click here.