The P{?UAS-park.L} entry in FlyBase is used to denote the transgenic construct present in an insertion when it is known that the inserted element is a mutated version of P{UAS-park.L} generated during transposition/excision, but details of the change to the inserted element, including whether or not one or both of the transposable element ends are affected, are not known.
Product of imprecise excision of the P{UAS-park.L} element, with a 1.1kb fragment of the original element remaining.