I am using a 'Channel Entry Model Extension Hook' in EE3 to allow me to carry out further validation of a selection of fields.
This is working fine, currently with the 'before_channel_entry_update' hook.
However, If the validation fails, I am unable to cancel the 'update' to the entry.
Can anyone shed any light on how I can:
- Cancel the update
- Display an error message of my choice