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: ZZZZZSESRW433
name: Bucks. County Council (Eton Rural District) Tree Preservation Order No.1 - 1951; dated 15/1/51 under
tree-preservation-order: undefined
TPO/BCC/1951/01
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.694118 51.528796,-0.694296 51.528352,-0.694731 51.527510,-0.694903 51.526941,-0.695419 51.524414,-0.695463 51.524416,-0.695518 51.524056,-0.695514 51.523983,-0.695548 51.523672,-0.695574 51.523580,-0.695594 51.523467,-0.695254 51.523393,-0.694870 51.523325,-0.693019 51.523169,-0.692993 51.523300,-0.692669 51.523299,-0.692617 51.523474,-0.692536 51.523696,-0.692441 51.524015,-0.692201 51.524309,-0.692113 51.524440,-0.692058 51.524602,-0.691995 51.524721,-0.691923 51.524915,-0.691830 51.525218,-0.691813 51.525349,-0.691793 51.525786,-0.691811 51.525819,-0.692167 51.525836,-0.692207 51.526374,-0.692269 51.526617,-0.692495 51.526631,-0.692500 51.527343,-0.692714 51.527348,-0.692681 51.527896,-0.692490 51.527892,-0.692486 51.527914,-0.692232 51.527911,-0.692314 51.528079,-0.692440 51.528181,-0.692440 51.528423,-0.692054 51.528425,-0.692033 51.528201,-0.692051 51.527920,-0.691923 51.527887,-0.691961 51.528687,-0.692073 51.528767,-0.692088 51.528711,-0.692142 51.528751,-0.692244 51.528768,-0.692230 51.528929,-0.694118 51.528796)))
point: POINT (-0.693641 51.52582)
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.