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: ZZZZDUESXE481
name: The Chiltern District Council (Land at Mounthill Wood, South of Welders Lane, Chalfont St Peter) Tre
tree-preservation-order: undefined
TPO/1989/017
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.586469 51.608249,-0.586491 51.608257,-0.586517 51.608023,-0.586549 51.607323,-0.586595 51.607246,-0.586900 51.606987,-0.587022 51.606907,-0.587364 51.606724,-0.587594 51.606630,-0.588392 51.606372,-0.589051 51.606250,-0.589066 51.605669,-0.589616 51.605735,-0.589603 51.605605,-0.589510 51.605070,-0.589280 51.605075,-0.589268 51.605061,-0.589216 51.604834,-0.588881 51.604839,-0.588723 51.604853,-0.588197 51.604859,-0.587965 51.604891,-0.587767 51.604943,-0.587491 51.604953,-0.586493 51.605075,-0.586298 51.605073,-0.585987 51.605126,-0.585699 51.605146,-0.585612 51.605159,-0.584869 51.607543,-0.586200 51.608164,-0.586409 51.608220,-0.586469 51.608249)))
point: POINT (-0.586962 51.60617)
notes
organisation
entry-date: 2010-02-18
start-date: 2010-02-18
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.