Solution : https://service.sap.com/sap/support/notes/650045 (SAP Service marketplace login required)
Key words :
typing reference type iv_settype_id, compare set type tables, front-end test system, affected front-end system, affected set types, exiting transaction comm_attrset, data loss occurs, system issues, production system, table entries
Related Notes :
| 663180 | Support Release 01 for CRM 3.1 |
| 653691 | SAPKU31006: Support Package 06 for CRM 3.1 |
| 601361 | Multi-value attributes not displayed (COMMPR01) |