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: ZZZZZSESRW448
name: South Bucks District Council Tree preservation Order No.18, 2009. Dated 12/6/09. Confirmed 22/9/09.
tree-preservation-order: undefined
TPO/SBDC/2009/18
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.620762 51.541982,-0.620730 51.541940,-0.620750 51.541892,-0.620770 51.541557,-0.620800 51.541215,-0.620800 51.541185,-0.620842 51.541061,-0.620864 51.540978,-0.620896 51.540874,-0.620890 51.540755,-0.620369 51.540779,-0.620245 51.540783,-0.620074 51.540757,-0.619956 51.540729,-0.619804 51.540689,-0.619744 51.540649,-0.619640 51.540767,-0.619528 51.540989,-0.619364 51.541228,-0.619308 51.541316,-0.619215 51.541425,-0.619061 51.541611,-0.619000 51.541735,-0.618995 51.541893,-0.619001 51.542032,-0.619282 51.542027,-0.619717 51.542014,-0.619884 51.541992,-0.620762 51.541982)))
point: POINT (-0.620005 51.541418)
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.