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: ZZZZZTESRW315
name: South Bucks District Council Tree preservation Order No.6, 2008. Dated 10/4/08. Confirmed 8/7/08.
tree-preservation-order: undefined
TPO/SBDC/2008/06
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.563595 51.592196,-0.563605 51.592074,-0.563625 51.592074,-0.563633 51.591959,-0.563614 51.591959,-0.563639 51.591876,-0.563646 51.591844,-0.563674 51.591505,-0.563678 51.591425,-0.563601 51.591427,-0.563418 51.591428,-0.563211 51.591451,-0.562900 51.591552,-0.562860 51.591567,-0.562828 51.591589,-0.562789 51.591635,-0.562778 51.591655,-0.562773 51.591669,-0.562770 51.591684,-0.562772 51.591701,-0.562776 51.591715,-0.562794 51.591750,-0.562809 51.591773,-0.562840 51.591810,-0.562863 51.591829,-0.562853 51.591864,-0.562867 51.591872,-0.563105 51.591981,-0.563373 51.592100,-0.563595 51.592196)))
point: POINT (-0.563292 51.591751)
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.