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: TPO979
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.644480 51.257878,0.644478 51.257862,0.644508 51.257820,0.644573 51.257815,0.644633 51.257851,0.645098 51.258400,0.645476 51.258812,0.645510 51.258862,0.645524 51.258904,0.645533 51.258936,0.645519 51.258953,0.645465 51.258965,0.645444 51.258957,0.645394 51.258924,0.645313 51.258851,0.645221 51.258732,0.645029 51.258508,0.644957 51.258409,0.644697 51.258130,0.644571 51.258003,0.644510 51.257952,0.644480 51.257878)))
point: POINT (0.645005 51.258384)
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 - G29 consisting of 32 Field Maple,
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.