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: ZZZZZWESRW775
name: Eton Rural District Council Tree Preservation Order No.3; 1963; made under S.29 of the Town and Coun
tree-preservation-order: undefined
TPO/ER/1963/03
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.666103 51.543568,-0.666138 51.543521,-0.666066 51.543443,-0.666055 51.543247,-0.665931 51.543137,-0.665779 51.543042,-0.665715 51.542991,-0.665731 51.542978,-0.666060 51.542958,-0.666382 51.542912,-0.666535 51.542910,-0.666811 51.542925,-0.667038 51.542911,-0.667163 51.542892,-0.667634 51.542790,-0.667852 51.542722,-0.668050 51.542634,-0.668140 51.542582,-0.668330 51.542582,-0.668315 51.542433,-0.668272 51.542287,-0.668090 51.542352,-0.668027 51.542401,-0.668010 51.542439,-0.667950 51.542507,-0.667861 51.542562,-0.667612 51.542649,-0.667346 51.542715,-0.667069 51.542758,-0.666928 51.542770,-0.666643 51.542778,-0.666518 51.542770,-0.666307 51.542774,-0.665880 51.542838,-0.665755 51.542838,-0.665836 51.542700,-0.665903 51.542628,-0.666000 51.542571,-0.666515 51.542402,-0.666509 51.542330,-0.666282 51.541487,-0.664464 51.541466,-0.663263 51.541820,-0.663463 51.541937,-0.664128 51.542249,-0.664348 51.542370,-0.664490 51.542462,-0.664757 51.542687,-0.665251 51.543041,-0.665339 51.543119,-0.665408 51.543164,-0.665502 51.543208,-0.665816 51.543384,-0.666103 51.543568)))
point: POINT (-0.66541 51.542229)
notes
organisation
entry-date: 2017-07-04
start-date: 2017-07-04
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.