I have a mandatory custom field. On create if I do not supply the value then I get an error and the ticket is not created. Thats great. But lets say that I supply the value "X" for this field on create and then later go in to update the ticket and make the custom field empty. At the same time I update some other fields and then try to save the changes. It saves all the other fields and reverts back the value of this field to "X" and shows warning messages.
I would like it to give an error instead and not save any of the values. Is this possible and if so, how?