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: ZZZZZXESRW226
name: South Bucks District Council Tree Preservation Order No. 6 1989; dated 2/3/89; made under Sections 6
tree-preservation-order: undefined
TPO/SBDC/1989/06
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.568716 51.581090,-0.568721 51.581078,-0.568723 51.581066,-0.568722 51.581053,-0.568718 51.581041,-0.568700 51.581019,-0.568671 51.581002,-0.568653 51.580996,-0.568635 51.580991,-0.568595 51.580989,-0.568575 51.580991,-0.568556 51.580995,-0.568538 51.581001,-0.568523 51.581008,-0.568498 51.581028,-0.568481 51.581053,-0.568475 51.581065,-0.568471 51.581084,-0.568471 51.581104,-0.568477 51.581123,-0.568488 51.581141,-0.568504 51.581157,-0.568524 51.581172,-0.568541 51.581177,-0.568559 51.581179,-0.568578 51.581180,-0.568597 51.581179,-0.568615 51.581176,-0.568632 51.581171,-0.568661 51.581157,-0.568681 51.581137,-0.568716 51.581090)))
point: POINT (-0.568594 51.581083)
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.