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: ZZZZZSESRW228
name: South Bucks District Council (No. 8) Tree Preservation Order 1990; dated 8/8/90; made under Sections
tree-preservation-order: undefined
TPO/SBDC/1990/08
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.566400 51.589950,-0.567084 51.589867,-0.567079 51.589867,-0.567096 51.589794,-0.567163 51.589545,-0.566647 51.589476,-0.566234 51.589385,-0.565946 51.589297,-0.565645 51.589171,-0.565153 51.588900,-0.564608 51.588578,-0.564563 51.588571,-0.564397 51.588608,-0.564390 51.588715,-0.564403 51.588781,-0.564466 51.588988,-0.564546 51.589444,-0.564582 51.589586,-0.564578 51.589680,-0.564549 51.589698,-0.564560 51.589877,-0.564607 51.590187,-0.564645 51.590375,-0.564685 51.590526,-0.564723 51.590634,-0.564832 51.590891,-0.565156 51.590810,-0.565357 51.590742,-0.566094 51.590350,-0.566176 51.590293,-0.566274 51.590192,-0.566346 51.590085,-0.566373 51.590032,-0.566400 51.589950)))
point: POINT (-0.565448 51.589768)
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.