Solution : https://service.sap.com/sap/support/notes/1583745 (SAP Service marketplace login required)
Key words :
= < content id >_sap_<message id>_as, automatically assign unique ids, unique content id, sap exchange infrastructure, avoid data loss, potential data loss, mustperform manual steps, content ids exist, call transaction sm30, integration engine configuration
Related Notes :
| 1588222 | SAP EhP2 for Netweaver 7.00 SP08 |
| 1570083 | SAP EHP1 FOR SAP NETWEAVER PI 7.1 SP07 |
| 1501345 | XI runtime: Manifest <attachment-name> is initial |