Solution : https://service.sap.com/sap/support/notes/65657 (SAP Service marketplace login required)
Key words : 
additional key words sales activity, roll area change, create message v1 628, sales activity processing, material &               long text, leave order processing, sales activity, order processing, sales order, sales activities
Related Notes : 
       
| 549163 | FAQ: Configuration in the sales order |