Tree preservation zone

There is a problem

reference: 007/68 A1
name: Tree Preservation Order number TPO 7.68 Great North Road, Little Paxton
tree-preservation-order: 007/68
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-0.268245 52.245598,-0.268190 52.245598,-0.268072 52.245558,-0.268017 52.245553,-0.267969 52.245570,-0.267764 52.245718,-0.267736 52.245747,-0.267735 52.245788,-0.267755 52.245824,-0.267871 52.245921,-0.268221 52.245663,-0.268361 52.245536,-0.268717 52.245284,-0.269018 52.245041,-0.269520 52.244722,-0.269968 52.244486,-0.269738 52.244280,-0.269569 52.244142,-0.269510 52.244170,-0.269590 52.244267,-0.269627 52.244328,-0.269640 52.244393,-0.269608 52.244451,-0.269562 52.244504,-0.269480 52.244570,-0.269360 52.244646,-0.269068 52.244769,-0.268805 52.244770,-0.268776 52.244781,-0.268789 52.244805,-0.268950 52.244888,-0.269067 52.244970,-0.268830 52.245151,-0.268633 52.245063,-0.268557 52.245048,-0.268400 52.245048,-0.268366 52.245090,-0.268356 52.245130,-0.268366 52.245168,-0.268414 52.245254,-0.268540 52.245376,-0.268245 52.245598)))
point: POINT (-0.268894 52.245018)
notes
entry-date: 2007-04-23
start-date: start-date must be a real date
end-date

Your dataset is missing the start-date column.

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

The date that the tree preservation order came into force, written in YYYY-MM-DD format.

Example: 1984-03-28