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: ZZZZDUESXE445
name: The Chiltern District Council (Land at Green Wood, School Lane, Seer Green, Buckinghamshire) Tree Pr
tree-preservation-order: undefined
TPO/1989/025
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.606344 51.615831,-0.606415 51.615668,-0.606419 51.615668,-0.606432 51.615646,-0.606435 51.615622,-0.606522 51.615379,-0.606561 51.615287,-0.606432 51.615274,-0.606298 51.615255,-0.606168 51.615234,-0.604948 51.615009,-0.604769 51.615018,-0.604597 51.614976,-0.604544 51.614966,-0.604455 51.614946,-0.604383 51.614946,-0.604311 51.614941,-0.604167 51.614918,-0.604127 51.614915,-0.604104 51.614930,-0.603950 51.615019,-0.603862 51.615064,-0.603838 51.615081,-0.603792 51.615118,-0.603772 51.615138,-0.603710 51.615222,-0.603654 51.615287,-0.603598 51.615347,-0.603569 51.615374,-0.603543 51.615401,-0.603495 51.615443,-0.603469 51.615475,-0.603445 51.615523,-0.603412 51.615572,-0.603397 51.615589,-0.603425 51.615598,-0.603522 51.615639,-0.603623 51.615655,-0.603676 51.615658,-0.603788 51.615673,-0.603830 51.615681,-0.603917 51.615714,-0.604206 51.615843,-0.604256 51.615859,-0.604312 51.615868,-0.604530 51.615896,-0.604625 51.615911,-0.604672 51.615920,-0.604785 51.615931,-0.605042 51.615937,-0.606274 51.615989,-0.606344 51.615831)))
point: POINT (-0.605016 51.615484)
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.