2349547 - Unexpected error when sending message to Ariba SN

When sending messages via PI to Ariba Network, it failed. When you open the failed message's Audit Log, you only see the following entry:

Exception caught by adapter framework: Error when sending message: Profile request failed for [Channel] <Communication Channel Name> with the following [ERROR] Unexpected error occurred when sending message to Ariba SN.

or

MP: exception caught with cause javax.resource.ResourceException: Error when sending message: Profile request failed for [Channel] <Communication Channel Name> with the following [ERROR] Unexpected error occurred when sending message to Ariba SN.

or

Message could not be forwarded to the JCA adapter. Reason: Error when sending message: Profile request failed for [Channel] <Communication Channel Name> with the following [ERROR] Unexpected error occurred when sending message to Ariba SN.

SAP NetWeaver 7.4

Ariba SN; Ariba Adapter;   , KBA , BNS-ARI-TRF , Automatic Hand-over to the Ariba Support Organization , BC-NWA-XPI , Process Integration (PI) Monitoring , Problem