Update keynote of link models

[manuel_f_perezii]

Hello Everyone.

I am trying to update keynote of each family of all the linked models of the host file.

However I get this exception upon stepping on the using transaction clause.

 var linkInstances = new FilteredElementCollector(doc).OfClass(typeof(RevitLinkInstance)).Cast<RevitLinkInstance>();
  
foreach (var linkInstance in linkInstances)
  {
     using (Transaction txLink = new Transaction(linkDoc, "Assign Keynote to Linked Model Family Types"))
     {
        //update keynote here
     }
}

Document is a linked file. Transactions can only be used in primary documents (projects or families.)

Is this a limitation and what are my options? 

Thank you in advance.