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: ZZZZDVESXE004
name: The Chiltern District Council (area of woodland at Halfway House, Nightingales Lane, Chalfont St Gil
tree-preservation-order: undefined
TPO/1986/008
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.558580 51.638757,-0.558607 51.638726,-0.557963 51.638404,-0.557927 51.638379,-0.557981 51.638344,-0.558411 51.638040,-0.557752 51.637738,-0.558042 51.637526,-0.557097 51.637204,-0.556981 51.637163,-0.556662 51.637448,-0.556509 51.637582,-0.556392 51.637681,-0.556341 51.637722,-0.556196 51.637847,-0.556141 51.637906,-0.556165 51.637913,-0.556358 51.637984,-0.556608 51.638100,-0.556822 51.638209,-0.556912 51.638250,-0.556968 51.638278,-0.557220 51.638416,-0.557473 51.638549,-0.557582 51.638602,-0.557918 51.638771,-0.558002 51.638816,-0.558248 51.638942,-0.558276 51.638927,-0.558355 51.638870,-0.558113 51.638748,-0.557683 51.638537,-0.557815 51.638449,-0.557878 51.638409,-0.558079 51.638502,-0.558580 51.638757)))
point: POINT (-0.557335 51.637928)
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.