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: ZZZZZSESRW398
name: Eton Rural District Council Tree Preservation Order No. 13 1972; dated 22/11/72; pursuant to Section
tree-preservation-order: undefined
TPO/ER/1972/13
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.544186 51.557164,-0.544194 51.555324,-0.544858 51.555310,-0.544841 51.554799,-0.544770 51.554425,-0.544335 51.554389,-0.542540 51.554715,-0.542296 51.554573,-0.541375 51.554968,-0.541559 51.555191,-0.541692 51.555324,-0.541771 51.555425,-0.541873 51.555579,-0.542323 51.556429,-0.542420 51.556620,-0.542477 51.556752,-0.542513 51.556743,-0.542600 51.556679,-0.542768 51.556420,-0.543126 51.556345,-0.543513 51.556701,-0.543442 51.556794,-0.543795 51.556890,-0.543740 51.557040,-0.542650 51.556741,-0.542486 51.556782,-0.542504 51.556840,-0.542556 51.556884,-0.542634 51.556938,-0.542715 51.556982,-0.542951 51.557086,-0.543285 51.557195,-0.543474 51.557236,-0.543543 51.557247,-0.543658 51.557251,-0.543875 51.557239,-0.544172 51.557197,-0.544186 51.557164)))
point: POINT (-0.543262 51.555605)
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.