Script is now generating more monitoredItems to ensure the MonitoredItemIds are in a new range.

Issue is still present with 1.03.341.385

Our proposal for a fix:

if( CreateMonitoredItemsHelper.Execute( { SubscriptionId: FirstSubscription, ItemsToCreate: items[0] } ) ) {
    var tempItem0 = items[0].clone();
    tempItem0.MonitoredItemId = items[0].MonitoredItemId;
    // Now add 1 item (will be used as linksToAdd[]) to the second subscription
    CreateMonitoredItemsHelper.Execute( { SubscriptionId: SecondSubscription, ItemsToCreate: items } );
    var tempItems = [];
    for (var i = 0; i < items.length; i++) tempItems = items[i].clone();
    CreateMonitoredItemsHelper.Execute( { SubscriptionId: SecondSubscription, ItemsToCreate: tempItems } );

    var tempItem1 = items[1].clone();
    var tempItem2 = items[2].clone();

    if( CreateMonitoredItemsHelper.Execute( { SubscriptionId: SecondSubscription, ItemsToCreate: [ tempItem1, tempItem2] } ) ) {
        DeleteMonitoredItemsHelper.Execute( { ItemsToDelete: items, SubscriptionId: SecondSubscription } );
        DeleteMonitoredItemsHelper.Execute( { ItemsToDelete: tempItems, SubscriptionId: SecondSubscription } );
        DeleteMonitoredItemsHelper.Execute( { ItemsToDelete: tempItem1, SubscriptionId: SecondSubscription } );
        // create the trigger and mix the items in both subscriptions (not allowed)
        SetTriggeringHelper.Execute( { SubscriptionId: FirstSubscription, TriggeringItemId: tempItem0, LinksToAdd: tempItem2, AddResults: new ExpectedAndAcceptedResults( StatusCode.BadMonitoredItemIdInvalid ) } );
        DeleteMonitoredItemsHelper.Execute( { ItemsToDelete: tempItem2, SubscriptionId: SecondSubscription } );
    }
    DeleteMonitoredItemsHelper.Execute( { ItemsToDelete: tempItem0, SubscriptionId: FirstSubscription } );
}

Previously, the second CreateMonitoredItemsHelper.Execute overwrites the content of items[0]. Now, items[0] is stored in tempItem0 and is used in the SetTriggeringHelper.Execute call.

Agreed with proposed fix and fixed accordingly.

Reviewed in CMP call