Key Attribute is used for linking Revit object with dRofus Objects. When syncronizing, dRofus will find the right object by searching for the object in Revit that has the same value as the object in dRofus.
The value in the dRofus Attribute and the Revit parameter have to be the same for the linking to work.
Every configuration is required to have a Key Attribute
Can only be one Key Attribute in each configuration.
The selected parameter has to be unique.