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: TPO131
name: 26/1988
tree-preservation-order: undefined
26/1988
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.552963 51.157511,0.553003 51.157517,0.553071 51.157512,0.553278 51.157535,0.553327 51.157557,0.553340 51.157579,0.553338 51.157595,0.553312 51.157622,0.553275 51.157634,0.553213 51.157624,0.553171 51.157600,0.553141 51.157595,0.553128 51.157618,0.553099 51.157631,0.553003 51.157637,0.552953 51.157606,0.552943 51.157580,0.552895 51.157565,0.552881 51.157531,0.552905 51.157515,0.552963 51.157511)))
point: POINT (0.55311 51.157571)
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 - G2 consisting of 2 Holly, 2 Hazel,
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.