Solution : https://service.sap.com/sap/support/notes/1530646 (SAP Service marketplace login required)
Key words :
customizing activity maintain inbound e-mail settings, configure e-mail inbound processing, compliance > common component settings > surveys, selected recipient's' work inboxes, abap runtime error log file, risk/activity/risk indicator window, backend e-mail configuration correctly, configuring adobe document services, compliance > general settings > workflow, maintain compliance survey delivery
Related Notes :
1549787 | Process Control 10.0 Support Package 03 - Master Note |
944221 | Troubleshooting if problems occur in forms processing |