Outbound Idocs in queue?
If an Idoc is sent from SAP to XI and XI system is down - is this Idoc always placed into an RFC queue or can it just be retained in SAP with yellow status until it can be processed again?
Idocs work on TRFC unless sequencing has been enabled in which case it will work on QRFC. So it will be in the O/B queue of your SAP system. once XI is available these will be picked up by XI.