Tree preservation zone

There is a problem

1000 entries with tree-preservation-order field must match the reference field in the tree preservation order dataset

reference: ZZZZDVESXE723
name: The Bucks County Council (Amersham and Eton Rural Districts) Tree Preservation Order No 5 - 1951 Con
tree-preservation-order: undefined
TPO/1951/005
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.545235 51.602365,-0.546068 51.602008,-0.546027 51.602005,-0.545983 51.601999,-0.545884 51.601978,-0.545621 51.601937,-0.545513 51.601930,-0.545493 51.601930,-0.545435 51.601933,-0.545301 51.601947,-0.545180 51.601957,-0.545078 51.601970,-0.544916 51.601994,-0.544853 51.602009,-0.544834 51.602016,-0.544801 51.602032,-0.544788 51.602043,-0.544771 51.602061,-0.544759 51.602086,-0.544755 51.602108,-0.544754 51.602121,-0.544762 51.602157,-0.544767 51.602170,-0.544786 51.602199,-0.544805 51.602219,-0.544827 51.602234,-0.544850 51.602247,-0.544896 51.602267,-0.545013 51.602309,-0.545102 51.602332,-0.545192 51.602352,-0.545235 51.602365)))
point: POINT (-0.54531 51.602115)
notes
entry-date: 2010-02-18
start-date: 2010-02-18
end-date

Your data is missing a tree-preservation-order.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.