Getting and setting UDF values in code

I’m trying to copy UDF values from a Project Quote to a Project when the quote gets converted to a new project.  In my Project Quote graph extension, I have the following code...
 

PMQuote quote = Base.Quote.Current;
PXCache baseCache = Base.Quote.Cache;

var udfONSITECUST = (PXStringState)baseCache.GetValueExt(quote, 
    "AttributeONSITECUST");
var udfDESIGNENGR = (PXStringState)baseCache.GetValueExt(quote, 
    "AttributeDESIGNENGR");
var udfSALESREPRE = (PXStringState)baseCache.GetValueExt(quote, 
    "AttributeSALESREPRE");

using (PXTransactionScope ts = new PXTransactionScope())
{
    ProjectEntry projectEntry = PXGraph.CreateInstance<ProjectEntry>();
    PMProject project = projectEntry.Project.Current = 
        PMProject.PK.Find(projectEntry, quote.QuoteProjectID);
    PXCache cache = projectEntry.Project.Cache;

    projectEntry.Project.Cache.SetValueExt(project, "AttributeONSITECUST", 
        udfONSITECUST?.Value);
    projectEntry.Project.Cache.SetValueExt(project, "AttributeDESIGNENGR", 
        udfDESIGNENGR?.Value);
    projectEntry.Project.Cache.SetValueExt(project, "AttributeSALESREPRE", 
        udfSALESREPRE?.Value);

    projectEntry.Actions.PressSave();

    ts.Complete();
}

When the new project is opened, the UDF fields have no value.  If I step through it, I see the values get and set, so the save to database for the UDFs doesn’t seem to be working.  Any suggestions to resolve or to accomplish this differently? I could update the UDF table explicitly, but yuck.