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: ZZZZZTESRW124
name: South Bucks District Council (No.6) Tree Preservation Order 1995; dated 8/3/95; made under Sections
tree-preservation-order: undefined
TPO/SBDC/1995/06
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.661404 51.604067,-0.661011 51.603976,-0.660676 51.603905,-0.660586 51.604148,-0.660552 51.604287,-0.660528 51.604419,-0.660496 51.604416,-0.660483 51.604507,-0.660478 51.604578,-0.660478 51.604652,-0.660485 51.604784,-0.660486 51.604836,-0.660483 51.604893,-0.660475 51.604942,-0.660467 51.604972,-0.660460 51.604989,-0.660440 51.605061,-0.660366 51.605284,-0.660325 51.605387,-0.660301 51.605442,-0.660295 51.605452,-0.660269 51.605525,-0.660355 51.605570,-0.660590 51.605520,-0.660745 51.605499,-0.661168 51.605448,-0.661364 51.605267,-0.661469 51.605167,-0.661676 51.604987,-0.661877 51.604804,-0.662235 51.604490,-0.662298 51.604405,-0.662311 51.604385,-0.662351 51.604289,-0.662355 51.604286,-0.662358 51.604275,-0.661716 51.604137,-0.661488 51.604087,-0.661404 51.604067)))
point: POINT (-0.661163 51.604696)
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.