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: TPO537
name: 1/1970
tree-preservation-order: undefined
1/1970
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.502328 51.274515,0.502477 51.274503,0.502408 51.274646,0.502388 51.274663,0.502373 51.274673,0.502133 51.274743,0.502080 51.274773,0.501948 51.274974,0.501924 51.275034,0.501936 51.275089,0.501730 51.275156,0.501731 51.275097,0.501815 51.274936,0.501952 51.274795,0.501963 51.274753,0.501956 51.274721,0.501975 51.274708,0.502315 51.274642,0.502328 51.274515)))
point: POINT (0.502043 51.274829)
notes: Maidstone Borough Council Tree Preservation Order No. 1 of 1970, under Section 29 of the Town and Country Planning Act 1962, and Section 16 of the Civic Amenities Act 1967. Area of Trees - A2 consisting 41 Larch, 8 Birch, 2 Elms
organisation
entry-date: 1970-04-17
start-date: 1970-04-17
end-date: 2004-07-01

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.