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: TPO109
name: 11/1996
tree-preservation-order: undefined
11/1996
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.519724 51.240235,0.519715 51.240194,0.519764 51.240127,0.519829 51.240121,0.519951 51.240078,0.520154 51.239954,0.520290 51.239735,0.520530 51.239488,0.520606 51.239438,0.520631 51.239411,0.520642 51.239379,0.520679 51.239324,0.520934 51.239222,0.521006 51.239185,0.521050 51.239147,0.521020 51.239070,0.521033 51.238856,0.521419 51.238847,0.521461 51.239202,0.521438 51.239246,0.521381 51.239303,0.521316 51.239349,0.520989 51.239544,0.520832 51.239649,0.520698 51.239756,0.520601 51.239866,0.520496 51.240017,0.520378 51.240158,0.520318 51.240214,0.520303 51.240224,0.520226 51.240228,0.519724 51.240235)))
point: POINT (0.520729 51.239555)
notes: The Maidstone Borough Council Tree Preservation Order No 11 of 1996 under Section 198 of the Town and Country Planning Act 1990 Woodlands - W1 comprising Ash, Sycamore and
organisation
entry-date: 1996-05-03
start-date: 1996-05-03
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.