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: TPO503
name: 17/1986
tree-preservation-order: undefined
17/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.657704 51.275178,0.657922 51.275424,0.658377 51.275853,0.658658 51.276105,0.658847 51.276289,0.658990 51.276404,0.659079 51.276464,0.659089 51.276504,0.659079 51.276536,0.659047 51.276584,0.658867 51.276760,0.658831 51.276786,0.658804 51.276804,0.658796 51.276637,0.658750 51.276537,0.658523 51.276228,0.658416 51.276120,0.658118 51.275854,0.658044 51.275771,0.657727 51.275480,0.657550 51.275279,0.657521 51.275220,0.657526 51.275182,0.657568 51.275157,0.657632 51.275157,0.657704 51.275178)))
point: POINT (0.658364 51.275976)
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.