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: TPO976
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.648361 51.258029,0.649332 51.257735,0.649858 51.257565,0.650466 51.257322,0.651073 51.257067,0.651122 51.257057,0.651160 51.257062,0.651186 51.257082,0.651188 51.257103,0.651179 51.257129,0.650819 51.257275,0.650591 51.257380,0.650497 51.257412,0.650230 51.257534,0.650038 51.257611,0.649712 51.257723,0.649402 51.257814,0.649291 51.257839,0.649121 51.257903,0.648969 51.257950,0.648617 51.258056,0.648439 51.258101,0.648373 51.258082,0.648351 51.258045,0.648361 51.258029)))
point: POINT (0.649788 51.257612)
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 - G8 consisting of 2 Norway 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.