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: ZZZZZWESRW790
name: Bucks County Council (Eton R. D.) Tree Preservation Order No. 3 1956; dated 1/3/56; made under S.28
tree-preservation-order: undefined
TPO/BCC/1956/03
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.563544 51.555917,-0.563295 51.555815,-0.562952 51.555663,-0.562653 51.557332,-0.562503 51.558185,-0.563438 51.557826,-0.563478 51.557604,-0.563662 51.556620,-0.564356 51.556884,-0.564460 51.556780,-0.565726 51.557225,-0.565771 51.557134,-0.565779 51.557123,-0.565788 51.557101,-0.565796 51.557067,-0.565802 51.557029,-0.565819 51.556947,-0.565820 51.556921,-0.565813 51.556891,-0.565787 51.556840,-0.565777 51.556825,-0.565754 51.556802,-0.565740 51.556792,-0.565712 51.556777,-0.565459 51.556677,-0.565322 51.556621,-0.565047 51.556512,-0.564942 51.556472,-0.564802 51.556415,-0.564341 51.556233,-0.564151 51.556156,-0.563758 51.556004,-0.563544 51.555917)))
point: POINT (-0.5637 51.556816)
notes
entry-date: 2017-07-04
start-date: 2017-07-04
end-date

Your data is missing a tree-preservation-order.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.