I want an error message when someone attempts to assign a task of a certain type if they don't assign it to the correct person.  

Here is what I have:

(OwnerId <> "Kyle Hill") && (ISPICKVAL (CallType, "PROGRAM MANAGEMENT - NEW ENROLLMENT"))

I get no errors when saving this rule, but also no errors no matter who I assign to the task.  

Any ideas? (i'm very new at this) 

Thanks in advance! 

I want an error message when someone attempts to assign a task of a certain type if they don't assign it to the correct person.  

Here is what I have:

(OwnerId <> "Kyle Hill") && (ISPICKVAL (CallType, "PROGRAM MANAGEMENT - NEW ENROLLMENT"))

I get no errors when saving this rule, but also no errors no matter who I assign to the task.  

Any ideas? (i'm very new at this) 

Thanks in advance!