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: ZZZZDVESXE706
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 6 - 1952 Confirmed by
tree-preservation-order: undefined
TPO/1952/006
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.594774 51.609238,-0.594782 51.609210,-0.594736 51.609198,-0.594675 51.609200,-0.594574 51.609215,-0.594505 51.609238,-0.594429 51.609249,-0.594293 51.609263,-0.594107 51.609260,-0.593934 51.609274,-0.593856 51.609269,-0.593642 51.609236,-0.593571 51.609232,-0.593538 51.609237,-0.593504 51.609245,-0.593418 51.609288,-0.593333 51.609334,-0.593367 51.609343,-0.593400 51.609355,-0.593427 51.609367,-0.593446 51.609380,-0.593469 51.609405,-0.593474 51.609416,-0.593518 51.609482,-0.593846 51.609442,-0.594023 51.609422,-0.594202 51.609404,-0.594413 51.609378,-0.594536 51.609359,-0.594620 51.609343,-0.594648 51.609337,-0.594693 51.609323,-0.594714 51.609314,-0.594730 51.609304,-0.594745 51.609291,-0.594766 51.609257,-0.594774 51.609238)))
point: POINT (-0.594012 51.609332)
notes
entry-date: 2010-02-18
start-date: 2010-02-18
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.