saguaros Thanks. I have set up a testing environment and I can see the alert.
Please consider to make this alert more meaningful. 'Invalid amount' is true of course, but from user perspective it would be better to prompt something like 'Deposit amount should be x.xx or higher', or something equal. Also, the alert is placed at some distance from the field so it is not always visible to everyone, depending on the fact is a user has scrolled a bit downward.
When you think of it: why make it possible in the first place to let a user change the amount to a value too low? Even better if the deposit field would react dynamically, so on the instant a user changes the value to something too low, the value changes back to the minimum amount instantly.
User experience would be a lot better.