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: TPO260
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.662832 51.283899,0.663621 51.283657,0.663855 51.283598,0.663988 51.283588,0.664755 51.283622,0.666145 51.283767,0.666227 51.283782,0.666248 51.283792,0.666277 51.284028,0.666321 51.284181,0.665997 51.284332,0.665833 51.284426,0.665713 51.284472,0.665632 51.284487,0.665371 51.284485,0.664907 51.284393,0.664799 51.284392,0.664405 51.284416,0.663763 51.284323,0.663490 51.284317,0.663212 51.284335,0.663066 51.284211,0.662995 51.284109,0.662889 51.284007,0.662835 51.283931,0.662832 51.283899)))
point: POINT (0.664648 51.284027)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W19 Mixed Deciduous trees consisting
organisation
entry-date: 1987-07-14
start-date: 1987-07-09
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.