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: TPO705
name: 21/1984
tree-preservation-order: undefined
21/1984
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.664449 51.292829,0.664228 51.292921,0.664049 51.292725,0.663393 51.292042,0.662939 51.291597,0.662664 51.291341,0.662289 51.291066,0.661772 51.290707,0.661578 51.290627,0.661647 51.290508,0.661841 51.290589,0.662034 51.290707,0.662274 51.290817,0.662353 51.290861,0.662462 51.290940,0.662511 51.290989,0.662572 51.290992,0.662855 51.291220,0.663094 51.291429,0.663226 51.291562,0.663408 51.291724,0.663810 51.292122,0.663949 51.292277,0.664011 51.292361,0.664449 51.292829)))
point: POINT (0.663144 51.291701)
notes: Maidstone Borough Council Tree Preservation Order No. 21 of 1984 under Section 60 of the Town and Country Planning Act 1971. Group - G1 Comprising Norway Spruce, Pine, Hawthorne
organisation
entry-date: 1984-10-15
start-date: 1984-09-21
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.