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: ZZZZDVESXE720
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 11 - 1951 Confirmed by
tree-preservation-order: undefined
TPO/1951/011
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.620562 51.694142,-0.620578 51.694151,-0.620773 51.694099,-0.620986 51.694088,-0.621104 51.694080,-0.621171 51.694027,-0.621286 51.693928,-0.621473 51.693756,-0.621652 51.693576,-0.621992 51.693264,-0.621942 51.693237,-0.621766 51.693148,-0.621594 51.693075,-0.621476 51.693023,-0.621411 51.692997,-0.621360 51.692978,-0.621231 51.692934,-0.621030 51.692868,-0.620997 51.692863,-0.620981 51.692866,-0.620971 51.692870,-0.620935 51.692896,-0.620765 51.693026,-0.620268 51.693418,-0.620131 51.693532,-0.620074 51.693584,-0.620040 51.693622,-0.620005 51.693692,-0.619974 51.693774,-0.619972 51.693787,-0.619979 51.693794,-0.620312 51.693996,-0.620562 51.694142)))
point: POINT (-0.620945 51.693523)
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.