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: ZZZZZRESRW928
name: Bucks. Country Council (Eton Rural District) Tree Preservation Order No.7; 1949; dated 30/6/49 made
tree-preservation-order: undefined
TPO/BCC/1949/07
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.644565 51.544901,-0.643672 51.544795,-0.642513 51.544628,-0.642481 51.544545,-0.642474 51.544497,-0.642428 51.544491,-0.642405 51.544445,-0.642719 51.543896,-0.643262 51.543261,-0.643917 51.544060,-0.644084 51.544155,-0.644194 51.544205,-0.644342 51.544252,-0.644650 51.544315,-0.644817 51.544291,-0.644666 51.544292,-0.644519 51.544216,-0.644313 51.544142,-0.644164 51.544075,-0.644062 51.544012,-0.643758 51.543312,-0.643449 51.542474,-0.643193 51.542049,-0.643112 51.541993,-0.643017 51.541945,-0.642888 51.541922,-0.642731 51.541912,-0.642581 51.541910,-0.642359 51.541923,-0.642032 51.541985,-0.641713 51.542122,-0.641587 51.542231,-0.639942 51.543886,-0.640774 51.544179,-0.640666 51.544629,-0.640483 51.545199,-0.640255 51.545825,-0.640012 51.546369,-0.641907 51.546730,-0.642358 51.545742,-0.642587 51.545191,-0.642638 51.545110,-0.643602 51.545128,-0.644447 51.545180,-0.644565 51.544901)))
point: POINT (-0.641893 51.544238)
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.