I am new to Craft but loving its ease of use so far.
I am having a problem however when setting up a plugin to display an error to the user when using the onBeforeSaveEntry hook when a user saves an entry. I am looking to determine the value of a field and then take the user back to the entry page and display an error to the user based on a certain selection. Is this something that can be done with the Craft page when saving an entry?