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: TPO665
name: 3/1983
tree-preservation-order: undefined
3/1983
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.634255 51.281053,0.634365 51.281077,0.634435 51.281106,0.634492 51.281141,0.634527 51.281203,0.634532 51.281227,0.634519 51.281254,0.634470 51.281296,0.634363 51.281334,0.634266 51.281355,0.634224 51.281375,0.634150 51.281377,0.634101 51.281357,0.634070 51.281338,0.634013 51.281280,0.633991 51.281246,0.633979 51.281208,0.633985 51.281178,0.634027 51.281120,0.634070 51.281093,0.634128 51.281067,0.634255 51.281053)))
point: POINT (0.634245 51.281212)
notes: Maidstone Borough Council Tree Preservation Order No 3 of 1983 as varied by the Maidstone Borough Council Tree Preservation Order No.14 of 1988 made under Section 60 of the Town and Country Planning Act 1971
organisation
entry-date: 1988-11-05
start-date: 1988-10-14
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.