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: TPO699
name: 16/1976
tree-preservation-order: undefined
16/1976
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.590257 51.293765,0.590273 51.293886,0.590183 51.293998,0.590161 51.294005,0.590199 51.293801,0.590209 51.293604,0.590252 51.293383,0.590286 51.293341,0.590550 51.293182,0.590777 51.293012,0.590843 51.292988,0.590993 51.292976,0.591162 51.292935,0.591517 51.292889,0.591675 51.292814,0.591765 51.292755,0.592005 51.292625,0.592210 51.292732,0.592263 51.292769,0.592279 51.292789,0.592281 51.292807,0.592261 51.292834,0.592164 51.292865,0.592118 51.292873,0.591990 51.292867,0.591755 51.292883,0.591518 51.292914,0.591169 51.292994,0.591064 51.293025,0.590893 51.293090,0.590637 51.293234,0.590401 51.293420,0.590321 51.293537,0.590292 51.293595,0.590261 51.293717,0.590257 51.293765)))
point: POINT (0.591145 51.293091)
notes: Maidstone Borough Council Tree Preservation Order No. 16 of 1976 under Section 60 of the Town and Country Planning Act 1971. Area of Trees - A6 comprising Ash (Fraxinus excelsior),
organisation
entry-date: 1976-07-12
start-date: 1976-07-02
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.