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: ZZZZDVESXE039
name: The Chiltern District Council (trees standing at Eastwoods, Burtons Lane, Little Chalfont) Tree Pres
tree-preservation-order: undefined
TPO/1986/003
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.560135 51.661145,-0.560112 51.661151,-0.560107 51.661180,-0.560115 51.661194,-0.560149 51.661209,-0.560208 51.661218,-0.560328 51.661232,-0.560423 51.661234,-0.560525 51.661222,-0.560597 51.661207,-0.560672 51.661181,-0.560684 51.661168,-0.560692 51.661148,-0.560697 51.661122,-0.560710 51.661105,-0.560742 51.661091,-0.561144 51.660977,-0.561184 51.660963,-0.561213 51.660938,-0.561219 51.660918,-0.561207 51.660894,-0.561190 51.660871,-0.561149 51.660866,-0.561108 51.660874,-0.561106 51.660869,-0.560987 51.660904,-0.560810 51.660953,-0.560135 51.661145)))
point: POINT (-0.560651 51.661071)
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.