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: TPO982
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.648322 51.258108,0.648369 51.258107,0.648434 51.258122,0.648678 51.258360,0.648834 51.258527,0.649358 51.259022,0.649584 51.259263,0.650074 51.259729,0.650301 51.259927,0.650288 51.259962,0.650268 51.259980,0.650197 51.259979,0.650135 51.259963,0.649966 51.259788,0.649871 51.259705,0.649588 51.259410,0.649260 51.259094,0.649146 51.258999,0.648897 51.258757,0.648281 51.258193,0.648264 51.258171,0.648270 51.258133,0.648289 51.258118,0.648322 51.258108)))
point: POINT (0.649242 51.259006)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G6 consisting of 27 Horse Chestnut,
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.