Which statement about the Lock Formula option in the Expressions dialog box is false?

The statement regarding the Lock Formula option in the Expressions dialog box, which indicates that expressions with locked formulas when created cannot be unlocked, is not true. In NX, once a formula is locked, it can indeed be unlocked at any time, allowing users the flexibility to make changes if necessary. This feature is particularly useful as it provides a safeguard against unintentional modifications while still permitting adjustments at the user’s discretion.

The other statements about locking formulas highlight its functionality effectively. Expressions can be locked at any point after their creation, providing a way to secure them. Locked formulas serve to prevent accidental changes, which is crucial when maintaining complex designs. The ability to unlock locked formulas underscores the system's flexibility and user control.