Hello Isabelle,
Welcome to the Community, thank you for your question!
At the moment, the only thing the system will flag up in regards to duplicates is transaction numbers - so if you use the same transaction number twice, it will pop up with a message to warn you of this. We do have a new feature being rolled out named 'Smart Scan' which looks through your account for things that could be mistakes, omissions, or signs of fraud - you could leave Feedback through the cog wheel to suggest this as a new feature to be added to Smart Scan.
Thank you,
Talia
