Tree preservation zone

There is a problem

tree-preservation-order column must match the reference field in the tree preservation order dataset

reference: 29-G1
name: Tree Preservation (No. 29) (Elder Way) Order 1985
tree-preservation-order: undefined
29
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-0.200193 51.894904,-0.200168 51.894909,-0.200144 51.894916,-0.200123 51.894926,-0.200106 51.894938,-0.200093 51.894953,-0.200084 51.894968,-0.200081 51.894985,-0.200083 51.895001,-0.200090 51.895017,-0.200102 51.895032,-0.200118 51.895044,-0.200138 51.895055,-0.200162 51.895063,-0.200187 51.895068,-0.200213 51.895070,-0.200240 51.895069,-0.200265 51.895065,-0.200289 51.895057,-0.200310 51.895047,-0.200327 51.895035,-0.200340 51.895021,-0.200348 51.895005,-0.200352 51.894989,-0.200350 51.894972,-0.200343 51.894957,-0.200331 51.894942,-0.200314 51.894929,-0.200294 51.894918,-0.200271 51.894910,-0.200246 51.894905,-0.200220 51.894903,-0.200193 51.894904)))
point: POINT (-0.200216 51.894987)
notes: Roaring Meg Retail And Leisure Park Monkswood Way Stevenage Herts
entry-date: 1985-12-09
start-date: 1985-12-09
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.