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: ZZZZZWESRW372
name: South Bucks District Council (No. 7) Tree Preservation Order; 1985; dated 18/10/85 made under Ss. 60
tree-preservation-order: undefined
TPO/SBDC/1985/07
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.639529 51.549595,-0.639543 51.549438,-0.639539 51.549415,-0.639529 51.549392,-0.639513 51.549371,-0.639492 51.549352,-0.639465 51.549336,-0.639434 51.549322,-0.639400 51.549312,-0.639364 51.549306,-0.639327 51.549304,-0.639290 51.549306,-0.639253 51.549312,-0.639219 51.549321,-0.639188 51.549334,-0.639161 51.549350,-0.639139 51.549369,-0.639123 51.549390,-0.639085 51.549563,-0.639016 51.549752,-0.639014 51.549768,-0.639016 51.549783,-0.639022 51.549799,-0.639032 51.549813,-0.639045 51.549827,-0.639062 51.549839,-0.639082 51.549848,-0.639105 51.549856,-0.639129 51.549861,-0.639154 51.549864,-0.639179 51.549864,-0.639252 51.549840,-0.639319 51.549810,-0.639379 51.549775,-0.639431 51.549735,-0.639473 51.549691,-0.639506 51.549644,-0.639529 51.549595)))
point: POINT (-0.639282 51.549578)
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.