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: ZZZZZSESRW436
name: Eton Rural District Council (No. 1) TPO 1955; dated 8/2/55; made under Section 28 of the Town and Co
tree-preservation-order: undefined
TPO/ER/1955/01
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.508543 51.580955,-0.508433 51.580780,-0.508408 51.580763,-0.508224 51.580699,-0.508147 51.580746,-0.507734 51.581069,-0.507657 51.581138,-0.507251 51.581569,-0.506852 51.582051,-0.507376 51.582188,-0.507577 51.582224,-0.507615 51.582175,-0.508166 51.582309,-0.508179 51.582292,-0.508161 51.582271,-0.508168 51.582246,-0.508305 51.582124,-0.507543 51.581735,-0.507468 51.581704,-0.508108 51.580989,-0.508543 51.580955)),((-0.510387 51.582127,-0.510319 51.582174,-0.510312 51.582233,-0.510299 51.582260,-0.510317 51.582292,-0.510371 51.582334,-0.510517 51.582234,-0.510628 51.582131,-0.510521 51.581990,-0.510447 51.581917,-0.510257 51.581752,-0.510214 51.581723,-0.510079 51.581653,-0.509327 51.581306,-0.508933 51.581112,-0.508716 51.580959,-0.508553 51.580829,-0.508675 51.581046,-0.509055 51.581258,-0.510025 51.581707,-0.509778 51.581888,-0.510387 51.582127)))
point: POINT (-0.508323 51.581683)
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.