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: ZZZZDUESXE405
name: The Chiltern District Council (Land at Knotts Wood, Off Blackwell Hall Lane and Horsehill Spring Woo
tree-preservation-order: undefined
TPO/1989/036
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.564710 51.702489,-0.565217 51.702680,-0.565394 51.702581,-0.565175 51.702441,-0.564941 51.702313,-0.564429 51.702090,-0.563673 51.701695,-0.563567 51.701623,-0.563474 51.701546,-0.563409 51.701476,-0.563235 51.701365,-0.563145 51.701286,-0.562925 51.701013,-0.562880 51.700972,-0.562778 51.700808,-0.562728 51.700704,-0.562699 51.700549,-0.562661 51.700264,-0.562531 51.700298,-0.562461 51.700359,-0.562384 51.700406,-0.562375 51.700422,-0.562372 51.700497,-0.562386 51.700626,-0.562393 51.700843,-0.562467 51.700937,-0.562496 51.701064,-0.562511 51.701099,-0.562669 51.701364,-0.562708 51.701419,-0.562778 51.701488,-0.562827 51.701551,-0.563539 51.702029,-0.563705 51.702118,-0.563962 51.702221,-0.564710 51.702489)))
point: POINT (-0.563524 51.701627)
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.