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: TPO608
name: 22/1987
tree-preservation-order: undefined
22/1987
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.641147 51.299063,0.641260 51.299066,0.641337 51.299086,0.641396 51.299114,0.641416 51.299146,0.641414 51.299182,0.641381 51.299219,0.641320 51.299239,0.641222 51.299253,0.641078 51.299293,0.640701 51.299378,0.640618 51.299373,0.640602 51.299357,0.640617 51.299311,0.640697 51.299251,0.640845 51.299190,0.640886 51.299142,0.641061 51.299075,0.641147 51.299063)))
point: POINT (0.641029 51.299212)
notes: The Maidstone Borough Council Tree Preservation Order No 22 of 1987 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G12 - 13 Oak, 1 Field Maple
organisation
entry-date: 1987-07-31
start-date: 1987-07-24
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.