[dev] Feature-request: specific error-message if ACL denies action

[Alexander Scholler]

Hi,

as far as I can see, very specific designed ACLs can be used to design a 
workflow, e.g.
   ticket may only be locked (to work on it) if the default priority
   "undefined" was changed to a specific value before

If a ACL is not true, a simple error-message "access denied" is 
displayed as far as I can remember.

It could be useful if a message can be defined on every ACL to be 
displayed if the ACL is not true, e.g.
   You have to specify Priority before working on the ticket.

Bye, Alex