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: ZZZZZWESRW938
name: Bucks County Council (Eton Rural District) Tree Preservation Order No. 7 - 1952; dated 9/10/52; made
tree-preservation-order: undefined
TPO/BCC/1952/07
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.513865 51.493449,-0.513346 51.494285,-0.513792 51.494371,-0.514144 51.494428,-0.514266 51.494463,-0.514754 51.494021,-0.514936 51.493874,-0.515218 51.493693,-0.515542 51.493530,-0.516658 51.493046,-0.517103 51.492865,-0.517369 51.492778,-0.517475 51.492780,-0.517888 51.492815,-0.518040 51.492846,-0.519136 51.492851,-0.519240 51.492855,-0.519283 51.492864,-0.519628 51.492955,-0.519882 51.493035,-0.520197 51.493173,-0.520436 51.493316,-0.520633 51.493396,-0.521112 51.493366,-0.521149 51.493375,-0.521909 51.493621,-0.523486 51.494114,-0.523570 51.494147,-0.523770 51.494249,-0.523823 51.494237,-0.523932 51.494166,-0.524124 51.494072,-0.524243 51.494032,-0.524517 51.493958,-0.524959 51.493777,-0.524644 51.493663,-0.524258 51.493541,-0.522813 51.493142,-0.522843 51.493103,-0.522265 51.492761,-0.520131 51.492124,-0.519336 51.491873,-0.519157 51.491933,-0.518861 51.491870,-0.518935 51.491687,-0.518377 51.491616,-0.517120 51.491575,-0.516283 51.491661,-0.515374 51.491839,-0.515240 51.491908,-0.514853 51.492214,-0.514543 51.492472,-0.514465 51.492499,-0.514317 51.492721,-0.513865 51.493449)))
point: POINT (-0.51831 51.492847)
notes
organisation
entry-date: 2017-07-04
start-date: 2017-07-04
end-date

Your dataset is missing the tree-preservation-order column.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.