Trying to connect to my AWS Database in Production. Cannot change variable

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Hi.  I would really appreciate some help. My mendix app is working “well” in production. I have now a database (same old) in AWS (postgres) and it works fine from my studio pro.  I understand (wrongly?) that I need to change some parameters in the Runtime configuration to try in Production the same database. But is not letting me, I need some guidance. It says “The requested custom setting is reserved by the internal system mendix” , for – for example – the variable: DatabaseHost   IN summary: How can I connect my production Mendix to the external postgres, like I do with my studio Pro??    
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