Solution : https://service.sap.com/sap/support/notes/633168 (SAP Service marketplace login required)
Key words : 
terms bus2000121 reason, attached advance correction, sap internet sales, sales contracts, valid contracts, program error, solution implement, prerequisites
Related Notes : 
       
| 634869 | SAPKU40001: Support Package 01 for CRM 4.0 |