A panel, with a horizontally and vertically active locking system, allows two of such floor panels to be connected to each other at their sides by providing one of these floor panels, by means of a downward movement, in the other panel. The vertically active locking element comprises a locking element in the form of an insert. The locking element comprises at least a pivotable lock-up body and an attachment portion. The locking element comprises a bending zone including a first boundary surface with the lock-up body as well as a second boundary surface with the attachment portion. The lock-up body and the attachment portion, in the non-coupled condition, extend underneath each other.