Hello good evening I Hope you are having a great day, today after migrate my IJ4.50 to the last version on Invoice Ninja 5 I found the situation that I need to validate a custom product field and with IJ5 is allowin duplicate information since we are using serial numbers and is not possible to duplicate rows with the same serial number.
I hope you can help me to implement this validation because is a crucial to have active this validation.
Thank you and I will be waiting your comments.