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: TPO791
name: 13/1986
tree-preservation-order: undefined
13/1986
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.656532 51.264993,0.656554 51.265029,0.656542 51.265069,0.656448 51.265143,0.656224 51.265259,0.655288 51.265836,0.654962 51.266048,0.654865 51.265993,0.654756 51.265908,0.654725 51.265874,0.654713 51.265842,0.654754 51.265485,0.654772 51.265437,0.654844 51.265348,0.654922 51.265233,0.655215 51.264921,0.655366 51.264793,0.655713 51.264579,0.656161 51.264426,0.656174 51.264431,0.656227 51.264469,0.656257 51.264552,0.656283 51.264668,0.656345 51.264714,0.656532 51.264993)))
point: POINT (0.655582 51.265205)
notes: Maidstone Borough Council Tree Preservation Order No 13 of 1986 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W7 Comprising : Mixed conifers and deciduous
organisation
entry-date: 1986-08-13
start-date: 1986-07-18
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.