Further to this post, there seems to be some issues with how RIR is creating shared parameters.
Even if a shared parameter file is specified in Revit, RIR creates a quasi shared parameter. It appears under Project Parameters.
But when you look at its properties, it says it is shared.
But looking at the shared parameters, it is not there.
Any idea how this can be fixed so that the parameter is a true shared parameter (defined in an external *txt file)?