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: TPO788
name: 13/1986
tree-preservation-order: undefined
13/1986
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.656983 51.271799,0.656469 51.271907,0.656282 51.271969,0.656180 51.272019,0.656045 51.272120,0.655926 51.272321,0.655769 51.272461,0.655577 51.272656,0.655479 51.272713,0.655219 51.272833,0.655156 51.272859,0.655046 51.272854,0.654988 51.272839,0.654830 51.272778,0.655361 51.272271,0.655553 51.272108,0.655913 51.271821,0.656362 51.271491,0.656412 51.271447,0.656650 51.271633,0.656707 51.271666,0.656977 51.271789,0.656983 51.271799)))
point: POINT (0.655834 51.272163)
notes: Maidstone Borough Council Tree Preservation Order No 13 of 1986 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W1 Comprising : Mixed conifers and deciduous
organisation
entry-date: 1986-08-13
start-date: 1986-07-18
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.