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: TPO1952_001HRS_G_018
name: G18
tree-preservation-order: undefined
TPO1952_001HRS
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-1.651921 53.844299,-1.651946 53.844183,-1.651940 53.844170,-1.651515 53.843995,-1.651493 53.843975,-1.651302 53.843336,-1.651225 53.843148,-1.651142 53.842982,-1.650950 53.842673,-1.650792 53.842805,-1.650973 53.843084,-1.651065 53.843268,-1.651123 53.843430,-1.651236 53.843870,-1.651244 53.843970,-1.651265 53.844020,-1.651320 53.844079,-1.651401 53.844134,-1.651665 53.844240,-1.651706 53.844268,-1.651466 53.844683,-1.651354 53.844906,-1.651300 53.845120,-1.651249 53.845400,-1.651471 53.845365,-1.651465 53.845325,-1.651506 53.845087,-1.651554 53.844954,-1.651657 53.844737,-1.651921 53.844299)))
point: POINT (-1.651389 53.844048)
notes
entry-date: 2026-02-12
start-date: 1952-01-28
end-date

Your dataset is missing the tree-preservation-order column.

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

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