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Additional options to append or prepend the copied value to any existing value.
Imagine a parent task which is 'collecting' the values of its sub-tasks in one field of the parent task, whenever those sub-tasks get closed.
Put your validation error message in your context
Ok, we have to admit the standard validation error message, which JSU provided sometimes left the users rather puzzled.
What should they make out of a message like: "The field Contact its contents must match against the regular expression ^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$" ?
When actually what it means is: "Please provide a valid email address for Contact".
Now you can provide any massage, which makes sense for your users.