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: TPO730
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.642399 51.297993,0.642444 51.297997,0.642850 51.298221,0.642959 51.298313,0.643076 51.298381,0.643133 51.298461,0.643154 51.298512,0.643124 51.298545,0.643059 51.298561,0.642967 51.298559,0.642878 51.298544,0.642674 51.298474,0.642606 51.298435,0.642420 51.298286,0.642306 51.298138,0.642296 51.298075,0.642301 51.298052,0.642321 51.298023,0.642352 51.298000,0.642399 51.297993)))
point: POINT (0.642701 51.298299)
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 - G8 - 7 Oak, 1 Field Maple, 2 Ash
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.