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: TPO133
name: 26/1988
tree-preservation-order: undefined
26/1988
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.553192 51.157650,0.553271 51.157655,0.553332 51.157685,0.553333 51.157698,0.553315 51.157715,0.553332 51.157740,0.553320 51.157766,0.553265 51.157789,0.553244 51.157814,0.553201 51.157813,0.553177 51.157801,0.553168 51.157782,0.553175 51.157752,0.553208 51.157729,0.553200 51.157717,0.553103 51.157729,0.553095 51.157785,0.553059 51.157821,0.553008 51.157818,0.552961 51.157777,0.552956 51.157752,0.552967 51.157721,0.553011 51.157678,0.553055 51.157677,0.553075 51.157664,0.553192 51.157650)))
point: POINT (0.553147 51.15773)
notes: Maidstone Borough Council Tree Preservation Order No 26 of 1988 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G3 consisting of 19 Sycamore,
organisation
entry-date: 1988-10-04
start-date: 1988-09-30
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.