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: TPO564
name: 1/1994
tree-preservation-order: undefined
1/1994
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.489494 51.273200,0.489562 51.273227,0.489608 51.273293,0.489679 51.273361,0.489699 51.273371,0.489794 51.273390,0.489933 51.273372,0.489954 51.273360,0.490071 51.273360,0.490135 51.273392,0.490147 51.273415,0.490147 51.273435,0.490136 51.273451,0.490066 51.273474,0.489881 51.273491,0.489802 51.273490,0.489643 51.273464,0.489510 51.273394,0.489475 51.273357,0.489436 51.273289,0.489414 51.273267,0.489408 51.273240,0.489413 51.273229,0.489455 51.273206,0.489494 51.273200)))
point: POINT (0.48975 51.273383)
notes: The Maidstone Borough Council Tree Preservation Order No 1 of 1994 under Section 198 of the Town and Country Planning Act 1990 Group of Trees - G17 consisting of 12 Italian Alder,
organisation
entry-date: 1994-01-28
start-date: 1994-01-21
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.