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: TPO490
name: 1/1969
tree-preservation-order: undefined
1/1969
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.540560 51.325882,0.540692 51.325900,0.540719 51.325910,0.540754 51.325951,0.540862 51.326152,0.540923 51.326233,0.541042 51.326356,0.541109 51.326408,0.541388 51.326528,0.541463 51.326581,0.541537 51.326619,0.541967 51.326788,0.542168 51.326881,0.542221 51.326920,0.542361 51.327058,0.542354 51.327086,0.542313 51.327086,0.542259 51.327067,0.542200 51.327037,0.542078 51.326949,0.542012 51.326914,0.541717 51.326810,0.541292 51.326633,0.541160 51.326562,0.540993 51.326450,0.540871 51.326350,0.540709 51.326157,0.540549 51.325931,0.540535 51.325900,0.540536 51.325884,0.540560 51.325882)))
point: POINT (0.541351 51.326517)
notes: County of Kent (Chatham Borough and Hollingbourne Rural District) Tree Preservation Order No.1, 1969 relating to trees and woodland at Walderslade (Rural Districts of Hollingbourne and Malling, Borough of Chatham).
organisation
entry-date: 1969-05-22
start-date: 1969-05-12
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.