You could create a MenuButton and set ShortCutKey of an empty MenuItem to Ctrl+V. As long as this form is in focus it won't let you paste anything into this form.
"Money is likewise the greatest chance and the greatest scourge of mankind."
This solution does provide no more enforcement than just telling the user to not do it. It is just a minor obstacle.
Have you ever heard about Shift+Ins or the right click context menu?
Answers
The PastIsValid property Luc mentioned is available in a Table level only and applies to complete records, not individual fields.
Have you ever heard about Shift+Ins or the right click context menu?