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: TPO431
name: 17/1986
tree-preservation-order: undefined
17/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.639089 51.279720,0.639078 51.279644,0.639097 51.279527,0.639106 51.279399,0.639139 51.279344,0.639218 51.279255,0.639874 51.279326,0.640014 51.279347,0.640225 51.279393,0.641365 51.279725,0.641784 51.279859,0.641921 51.279915,0.641776 51.280013,0.641275 51.280279,0.641031 51.280406,0.640819 51.280496,0.640458 51.280690,0.639799 51.281026,0.639749 51.280964,0.639602 51.280740,0.639502 51.280628,0.639434 51.280524,0.639392 51.280425,0.639370 51.280328,0.639316 51.280223,0.639289 51.280129,0.639185 51.279934,0.639144 51.279881,0.639106 51.279804,0.639082 51.279731,0.639089 51.279720)))
point: POINT (0.640221 51.280031)
notes: Maidstone Borough Council Tree Preservation Order No 17, 1986 under Section 60 of the Town and Country Planning Act 1971 dated 19th July 1986. Confirmed 8th October 1986
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.