That error indicates a problem in the OID Sync table - Orderitem_identifier.
From the ACS_ImpSetOrderResultWsync SP:
select @count = count(*) from Orderitem_identifier
where EntryCode = @QC_EntryCode
AND ReqPerfLocDE = @RPL
If the count is greater than one, then this error code is returned. It means that you have the same RPL order code synced to multiple OID's. I would do an SSMT:Order Performing Facility Identifiers extract and search for the order code that is giving the error. You'll probably find the Performing Location Specific Orderable EntryCode assigned to multiple OID's. Find the one that is incorrectly synched, mark it for deletion, and import via SSMT. That should resolve the ConnectR error after a refile.