Thanks Daniel for your quick reply.

In my case the problem was the connection string of the Cozyroc Dynamics CRM Destination. It has a long connection string. The solution was to store only the parameters that I really need and not the whole string, i.e. the Organization Name, Server Host, Server User, etc.

At the end the common symptom is the length of the value to be stored, which must not exceed 255 characters.

Kind Regards