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: TPO992
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.657675 51.262958,0.657400 51.263015,0.657339 51.263020,0.657252 51.262994,0.657195 51.262894,0.657147 51.262835,0.657080 51.262774,0.656983 51.262657,0.656628 51.262324,0.656549 51.262231,0.656350 51.262023,0.656224 51.261924,0.656161 51.261839,0.656016 51.261747,0.655854 51.261661,0.655811 51.261596,0.655808 51.261576,0.655807 51.261506,0.655814 51.261474,0.655835 51.261456,0.655836 51.261419,0.655818 51.261353,0.655755 51.261308,0.655605 51.261262,0.655559 51.261240,0.655494 51.261186,0.655458 51.261137,0.655444 51.261106,0.655444 51.261065,0.655477 51.260952,0.655476 51.260920,0.655338 51.260733,0.655310 51.260679,0.655258 51.260541,0.655260 51.260520,0.655279 51.260505,0.655446 51.260498,0.657675 51.262958)))
point: POINT (0.656381 51.261791)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W2 mixed Deciduous and Conifer
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.