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: TPO428
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.674746 51.278692,0.675311 51.278385,0.675459 51.278323,0.675535 51.278282,0.675596 51.278275,0.675635 51.278296,0.676370 51.278962,0.676523 51.279116,0.676592 51.279197,0.676368 51.279344,0.676195 51.279443,0.675948 51.279557,0.675754 51.279633,0.675571 51.279725,0.675494 51.279737,0.675456 51.279732,0.675408 51.279760,0.675345 51.279670,0.675159 51.279458,0.675037 51.279305,0.674971 51.279183,0.674956 51.279115,0.674935 51.278905,0.674918 51.278860,0.674894 51.278817,0.674746 51.278692)))
point: POINT (0.675618 51.279022)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W6 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.