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: tpo256
name: Broadgate Hospital, Broadgate, Walkington - 1987
tree-preservation-order: undefined
259
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-0.460941 53.827258,-0.460773 53.827185,-0.460390 53.826377,-0.460147 53.826422,-0.459858 53.825806,-0.459759 53.825781,-0.459387 53.824955,-0.458757 53.825137,-0.458056 53.825360,-0.458691 53.826118,-0.458142 53.826283,-0.458421 53.826620,-0.459245 53.826375,-0.459563 53.826735,-0.459314 53.826940,-0.458725 53.827123,-0.458878 53.827315,-0.456623 53.827970,-0.455371 53.826491,-0.454690 53.826696,-0.454468 53.826450,-0.453216 53.826880,-0.455116 53.829068,-0.455144 53.829110,-0.455934 53.828942,-0.456460 53.828854,-0.456945 53.828783,-0.457289 53.828722,-0.457583 53.828642,-0.458745 53.828199,-0.459032 53.828066,-0.459646 53.827753,-0.460941 53.827258)))
point: POINT (-0.457109 53.827364)
notes
entry-date: 1987-07-14
start-date: 1987-07-14
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.