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: TPO607
name: 1/1975
tree-preservation-order: undefined
1/1975
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.594480 51.298311,0.594600 51.298278,0.594633 51.298366,0.594631 51.298434,0.594704 51.298508,0.594726 51.298641,0.594702 51.298852,0.594688 51.299065,0.594648 51.299291,0.594593 51.299538,0.594580 51.299765,0.594452 51.299755,0.594433 51.299735,0.594448 51.299687,0.594557 51.299114,0.594596 51.298748,0.594585 51.298641,0.594588 51.298570,0.594575 51.298494,0.594525 51.298385,0.594480 51.298311)))
point: POINT (0.594597 51.299039)
notes: County of Kent (Maidstone Borough) Tree Peservation Order No. 1 of 1975 under Section 60 of the Town and Country Planning Act 1971. Area of Trees - A1 The several Ash, Field Maple,
organisation
entry-date: 1975-10-29
start-date: 1975-09-30
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.