ADF-BC/JSF How to display acustom error message from a backing bean

Hi all
Can anybody provide an example of how to manipulate the list of error messages from a JSF backing bean.
In my code I use a different navigation case and this directs the user to the page displaying the error message but I am sure that there must be a more elegant way.
Thanks in advance
Thanassis

Thanks Kris
I think you 've put me on the right track here, it's just that in my case what I really want to do is prevent my users from editing records not belonging to their own group. This is done via a selectOne table component and then the backing bean code tests if the value #{row.UserGroup} matches the #{bindings.LoggedOnUserGroup.inputValue}. If the values are equal then the beans returns the navigation case to the edit page. Otherwise it returns the navigation case for the "cannot edit" page.
So what I am thinking is to return null and somehow raise the right kind of exception in order to display the error in the af:messages tag.
Thanassis

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