Hi,
I got a table for my news articles which are normally linked to a table 
which specifies the region/country where my news comes from.
I said that this region needs to be in the region table (IS_IN_DB)
Now I need also news like news for my site where there should not be a 
region specified. But in all other cases it should be.

So my Idea was to add a bolean Field called SiteNews.
Is it possible to have a validator which asks if a field is true or false 
and decides whether a field needs to be empty or in the DB?

thanks for your help

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