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: TPO413
name: 17/1986
tree-preservation-order: undefined
17/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.640954 51.278777,0.640865 51.278826,0.640779 51.278817,0.640750 51.278803,0.640726 51.278776,0.640706 51.278737,0.640703 51.278687,0.640747 51.278617,0.640878 51.278454,0.641039 51.278319,0.641198 51.278212,0.641536 51.278046,0.641787 51.277933,0.642142 51.277805,0.642302 51.277911,0.642120 51.278013,0.641724 51.278138,0.641552 51.278238,0.641361 51.278325,0.641273 51.278374,0.641175 51.278448,0.641059 51.278571,0.641024 51.278621,0.640954 51.278777)))
point: POINT (0.6414 51.278272)
notes: Maidstone Borough Council Tree Preservation Order No 17, 1986 under Section 60 of the Town and Country Planning Act 1971 dated 19th July 1986. Confirmed 8th October 1986
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.