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: TPO989
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.655174 51.260507,0.655190 51.260505,0.655230 51.260604,0.655274 51.260662,0.655194 51.260674,0.654906 51.260751,0.654301 51.260935,0.653976 51.261022,0.653682 51.261124,0.653368 51.261217,0.653296 51.261100,0.653287 51.261052,0.653272 51.261021,0.653418 51.260938,0.653944 51.260679,0.654231 51.260582,0.654384 51.260539,0.654715 51.260488,0.655082 51.260514,0.655174 51.260507)))
point: POINT (0.654229 51.260796)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W3 mixed Deciduous consisting mainly of
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.