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: TPO693
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.636008 51.289184,0.636044 51.289165,0.636176 51.289149,0.636214 51.289166,0.636244 51.289213,0.636299 51.289261,0.636312 51.289301,0.636308 51.289323,0.636314 51.289338,0.636384 51.289466,0.636440 51.289499,0.636464 51.289524,0.636487 51.289612,0.636512 51.289647,0.636558 51.289683,0.636574 51.289715,0.636711 51.289890,0.636753 51.289968,0.636786 51.290004,0.636830 51.290072,0.636825 51.290094,0.636803 51.290116,0.636696 51.290144,0.636635 51.290151,0.636538 51.289991,0.636365 51.289758,0.636141 51.289414,0.636008 51.289184)))
point: POINT (0.63642 51.289653)
notes: The Maidstone Borough Council Tree Preservation Order No 18 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G21 - 1 Ash, 4 Field Maple, 16 Oak
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.