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: ZZZZZWESRW286
name: South Bucks District Council (No. 18) Tree Preservation Order 1993; dated 21/12/93; made under Secti
tree-preservation-order: undefined
TPO/SBDC/1993/18
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.612184 51.552562,-0.612205 51.552561,-0.612225 51.552558,-0.612244 51.552553,-0.612276 51.552536,-0.612288 51.552526,-0.612298 51.552514,-0.612303 51.552502,-0.612305 51.552489,-0.612304 51.552476,-0.612299 51.552464,-0.612291 51.552452,-0.612279 51.552441,-0.612265 51.552432,-0.612248 51.552424,-0.612229 51.552418,-0.612189 51.552413,-0.612168 51.552414,-0.612148 51.552417,-0.612129 51.552423,-0.612111 51.552430,-0.612096 51.552439,-0.612084 51.552449,-0.612075 51.552461,-0.612069 51.552473,-0.612067 51.552486,-0.612069 51.552499,-0.612074 51.552512,-0.612082 51.552524,-0.612108 51.552544,-0.612125 51.552551,-0.612143 51.552557,-0.612163 51.552561,-0.612184 51.552562)))
point: POINT (-0.612186 51.552488)
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.