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: ZZZZDUESXE293
name: The Chiltern District Council (Land at Copperkins Lane, Amersham and Chesham Bois) Tree Preservation
tree-preservation-order: undefined
TPO/1991/010
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.624335 51.687509,-0.624358 51.687532,-0.624367 51.687550,-0.624374 51.687557,-0.624396 51.687566,-0.624425 51.687570,-0.624451 51.687568,-0.624466 51.687565,-0.624476 51.687557,-0.624492 51.687535,-0.624495 51.687521,-0.624491 51.687507,-0.624480 51.687492,-0.624441 51.687452,-0.624413 51.687432,-0.624361 51.687409,-0.624245 51.687365,-0.624155 51.687326,-0.624138 51.687314,-0.624102 51.687280,-0.624061 51.687264,-0.624037 51.687258,-0.624020 51.687256,-0.624004 51.687257,-0.623988 51.687262,-0.623977 51.687267,-0.623967 51.687275,-0.623962 51.687285,-0.623962 51.687298,-0.623969 51.687311,-0.623979 51.687322,-0.623989 51.687330,-0.624030 51.687351,-0.624136 51.687401,-0.624188 51.687434,-0.624249 51.687458,-0.624292 51.687477,-0.624329 51.687503,-0.624335 51.687509)))
point: POINT (-0.624243 51.687411)
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.