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: TPO986
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.655128 51.260441,0.654673 51.260457,0.654504 51.260471,0.654419 51.260488,0.654105 51.260579,0.653880 51.260663,0.653431 51.260868,0.653369 51.260868,0.653345 51.260849,0.653338 51.260833,0.653337 51.260819,0.653356 51.260803,0.653419 51.260766,0.653766 51.260607,0.654142 51.260471,0.654350 51.260427,0.654549 51.260395,0.654777 51.260394,0.655232 51.260370,0.655270 51.260382,0.655282 51.260403,0.655272 51.260428,0.655253 51.260439,0.655128 51.260441)))
point: POINT (0.654204 51.26056)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G5 consisting of 12 Ash, 2 Field
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.