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: ZZZZDUESXE403
name: The Chiltern District Council (Land at Evans Halshaw (Chesham) Ltd, Ashley Green Road and OS Fields
tree-preservation-order: undefined
TPO/1989/037
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.596541 51.726096,-0.596358 51.726254,-0.596364 51.726275,-0.596376 51.726286,-0.596394 51.726293,-0.596415 51.726298,-0.596432 51.726299,-0.596458 51.726297,-0.596478 51.726288,-0.596501 51.726271,-0.596694 51.726096,-0.597252 51.725596,-0.597625 51.725264,-0.597952 51.724986,-0.597965 51.724971,-0.597975 51.724951,-0.597973 51.724933,-0.597970 51.724929,-0.597963 51.724924,-0.597920 51.724909,-0.597875 51.724945,-0.597794 51.724998,-0.597747 51.725014,-0.597735 51.725021,-0.597724 51.725049,-0.597711 51.725070,-0.597643 51.725122,-0.597628 51.725139,-0.597417 51.725337,-0.597093 51.725620,-0.597000 51.725698,-0.596541 51.726096)))
point: POINT (-0.597153 51.725624)
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.