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: ZZZZDVESXE501
name: The Amersham Rural District Council (Windmill Wood, Amersham) Tree Preservation Order, 1970 [No 51 o
tree-preservation-order: undefined
TPO/1970/051
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.624935 51.681714,-0.624945 51.681669,-0.624948 51.681643,-0.624955 51.681629,-0.624966 51.681594,-0.624988 51.681512,-0.625007 51.681415,-0.625014 51.681369,-0.625014 51.681346,-0.624931 51.681331,-0.624924 51.681328,-0.624826 51.681303,-0.624537 51.681231,-0.624450 51.681436,-0.624410 51.681569,-0.624524 51.681578,-0.624610 51.681679,-0.624638 51.681950,-0.624367 51.681946,-0.624350 51.681944,-0.624263 51.682162,-0.624335 51.682143,-0.624422 51.682123,-0.624479 51.682112,-0.624501 51.682156,-0.624518 51.682195,-0.624531 51.682239,-0.624631 51.682227,-0.624720 51.682220,-0.624779 51.682213,-0.624779 51.682197,-0.624786 51.682173,-0.624791 51.682169,-0.624868 51.682169,-0.624892 51.682167,-0.624899 51.682164,-0.624903 51.682157,-0.624909 51.681926,-0.624918 51.681811,-0.624935 51.681714)))
point: POINT (-0.624697 51.681738)
notes
entry-date: 2010-02-18
start-date: 2010-02-18
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.