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: TPO349
name: 17/1986
tree-preservation-order: undefined
17/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.653823 51.272534,0.653765 51.272602,0.653713 51.272584,0.653612 51.272573,0.653294 51.272598,0.652794 51.272659,0.651998 51.272793,0.651517 51.272825,0.650452 51.272867,0.650350 51.272796,0.650231 51.272737,0.649777 51.272573,0.649557 51.272482,0.649513 51.272457,0.649193 51.272157,0.649131 51.272082,0.649208 51.272068,0.649299 51.272030,0.649391 51.272007,0.649519 51.271953,0.649712 51.271863,0.649855 51.271770,0.649918 51.271709,0.649943 51.271675,0.649951 51.271646,0.649949 51.271599,0.649906 51.271489,0.649907 51.271447,0.649896 51.271438,0.649941 51.271388,0.650025 51.271361,0.650311 51.271627,0.650468 51.271712,0.650597 51.271756,0.650683 51.271778,0.650787 51.271789,0.651413 51.271829,0.651792 51.271862,0.652255 51.271937,0.652709 51.272074,0.653298 51.272288,0.653584 51.272414,0.653823 51.272534)))
point: POINT (0.651214 51.272287)
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.