Setting dynamic recipient for a publication is failing

Question

I have a publication which has the dynamic recipient set up as a crystal report template. I am trying to change this dynamic recipient template using the below code. However, it does not work-
string newPublicationQuery = @"SELECT * FROM CI_INFOOBJECTS WHERE SI_KIND = '"
    + InfoStore.CeKind.PUBLICATION + "' AND SI_NAME = '" + newPublicationTitle + "' AND SI_INSTANCE = 0";
newPublicnInfoObjects = infoStore.Query(newPublicationQuery);
if (newPublicnInfoObjects != null && newPublicnInfoObjects.Count > 0)
    newPublication = (Publication)newPublicnInfoObjects[1];
    // Get the collection of publication event handlers and add a handler to retrieve dynamic recipients.
    handlers = newPublication.PublicationEventHandlers;
    handler = handlers.GetPublicationEventHandler(2583);
    handlerInfo = handler.Add();
    // Configure the event handler to use a dynamic recipient data provider.
    handlerInfo.PluginClassName = "com.businessobjects.publisher.dynamicrecipients.crystalreports.CRDataProvider";
    // Set the new report template as the dynamic recipient template for the publication
    handlerInfo.DynamicDataDocumentID = newDynRecRepId;
    newPublication.Save();
    infoStore.Commit(newPublicnInfoObjects);
The code works without any errors. However the dynamic recipient template is still the same old one.
Can anyone please help? Thanks in advance.

Answer 1

Thanks for the prompt response Dan.
I checked the Publication Extension link and didn't see any extensions there. I assumed the event handler is present because the Add() was giving an error (like you say above). And yes, it was because it already had property "SI_ON_READ_RECIPIENTS" in the object.
I have now done the following changes to the code to see if it helps-
// Get the collection of publication event handlers and add a handler to retrieve dynamic recipients.
handlers = newPublication.PublicationEventHandlers;
handlers.RemovePublicationEventHandler(2583);
handler = handlers.AddPublicationEventHandler(2583);
handlerInfo = handler.Add();
// Configure the event handler to use a dynamic recipient data provider.
handlerInfo.PluginClassName = "com.businessobjects.publisher.dynamicrecipients.crystalreports.CRDataProvider";
handlerInfo.DynamicDataDocumentID = newDynRecRepId;
Above I remove the eventhandler and add it again. However, even this does not work. The publication still has the old dynamic recipient template. Not sure what I am missing here.