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: TPO215
name: 5/1983
tree-preservation-order: undefined
5/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.618183 51.275288,0.618248 51.275297,0.618323 51.275351,0.618482 51.275577,0.618504 51.275612,0.618512 51.275713,0.618536 51.275771,0.618578 51.275838,0.618634 51.275896,0.618685 51.275969,0.618719 51.276057,0.618723 51.276120,0.618666 51.276162,0.618649 51.276184,0.618541 51.276225,0.618262 51.276364,0.618148 51.276445,0.618099 51.276452,0.618065 51.276429,0.618045 51.276386,0.618088 51.276335,0.618335 51.276169,0.618473 51.276128,0.618526 51.276103,0.618534 51.276052,0.618422 51.275830,0.618356 51.275740,0.618331 51.275667,0.618276 51.275561,0.618165 51.275395,0.618136 51.275338,0.618140 51.275300,0.618183 51.275288)))
point: POINT (0.618406 51.2759)
notes: The Maidstone Borough Council Tree Preservation Order No.5 of 1983 under provisions of Section 60 & 61 of the Town and Country Planning Act 1971 Woodlands - W1 Comprising the several Oak,
organisation
entry-date: 1983-02-25
start-date: 1983-02-25
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.