Running the following query and inserting the GUID of the item that is not replicating into the query returned something similar to the following:
-- SQL query
select r._eventTime, d.Name as Destination, r.StatusCode, r.StatusText
from Evt_NS_Object_Replication_Status r
join vSource d on d.Guid = r.RemoteNS
where r.LocalGuid = '<guid>' -- Guid of Item not replicating
-- Query results
_evnetTime Destination StatusCode StatusText
2019-07-29 15:44:53.043 SMP8-1.epm.local -2147212798 DependentHasNoReplicationSupportOnDestinationNS
SMP 8.5 RU1
One or more dependent products are missing from the database.
Explanation: A timing snafu during an upgrade or update caused an install product to be rolled back or for its "ProductUninstalled" column bit to be set to 1 and it was never turned back on.
To verify run the following SQL against the database of the Child SMP server that cannot receive the replicated object(s)
select distinct p.ProductGuid, prd.Name, 'Missing or Uninstalled' as [Product Status]
from Item p
join Item prd on prd.Guid = p.ProductGuid
left join vProduct vprd on vprd.Guid = p.ProductGuid
where vprd.Guid is null or p.ProductUninstalled = 1
order by 2
If the previous query returns any rows then one of the products identified is likely a necessary component of the items being replicated to the server. If the product shows as uninstalled then this is likely the problem.
NOTE: If the above query doesn't seem to identify any products that stand out then it is possible that, although a product is seen as installed in the database, it may not be functioning correctly.
Examine the SMP logs via the LogViewer and filter on key word "Replicat" if a warning or error similar to the following is found then the assemblies for the product(s) is missing or damaged.
Description: Unable to examine the specified product: adda365d-971c-43eb-bd36-2ebdba77a45a
An unexpected exception has occured during CreateInstance.
Assembly: Altiris.Monitor.Common, Version=22.214.171.124, Culture=neutral, PublicKeyToken=d516cb311cfb6e4f
[Altiris.NS.AeXClassActivatorException @ Altiris.NS]
at Altiris.NS.ClassActivator.CreateInstance(String assembly, String type, Object parameters)
at Altiris.NS.ItemManagement.Item.CreateInstance(String strClassAssembly, String strClassType, Object parameters, Guid itemGuid)
at Altiris.NS.ItemManagement.Item.GetItemInternal(Guid itemGuid, IEnumerable`1 accessPermissions, ItemLoadFlags itemLoadFlags, Boolean& cacheHit)
at Altiris.NS.ItemManagement.Item.GetItemInternal(Guid itemGuid, IEnumerable`1 accessPermissions, ItemLoadFlags itemLoadFlags)
Could not load file or assembly 'Altiris.Monitor.Common, Version=126.96.36.199, Culture=neutral, PublicKeyToken=d516cb311cfb6e4f' or one of its dependencies. The system cannot find the file specified.
[System.IO.FileNotFoundException @ mscorlib]
In the above example Monitor Solution was supposed to be installed but the necessary assembly to load replicable items for the product were missing. If the parent is given information that any product is damaged or missing then it will likely stand down and make note in Evt_NS_Object_Replication_Status that items with some form of relation or dependencies to the product cannot be replicated. (-2147212798 DependentHasNoReplicationSupportOnDestinationNS )
If these log entries are found install or reinstall/repair the product listed.