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: TPO493
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.677936 51.270221,0.677931 51.270267,0.677873 51.270287,0.677868 51.270327,0.677259 51.270376,0.676467 51.270478,0.676017 51.270495,0.675664 51.270532,0.675406 51.270573,0.674975 51.270612,0.674553 51.270661,0.674466 51.270567,0.674331 51.270460,0.674095 51.270220,0.675161 51.270059,0.676253 51.269864,0.676488 51.269839,0.676779 51.269836,0.676902 51.269846,0.677062 51.269873,0.677609 51.269988,0.677978 51.270053,0.677986 51.270117,0.677936 51.270221)))
point: POINT (0.676051 51.27023)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W16 Mixed Deciduous trees consisting
organisation
entry-date: 1987-07-14
start-date: 1987-07-09
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.