Solution : https://service.sap.com/sap/support/notes/642269 (SAP Service marketplace login required)
Key words : 
delivered wit hsupor 2, symptom note 642944 describes, read note 642944 note, solution crm corrections, note describes, crm server, mutual change, sales documents, terms scenario, program error
Related Notes : 
       
| 642944 | Interdependent changes in sales orders | 
| 630778 | Scenario A: Mutual change of sales documents - PI | 
| 623652 | Scenario A: Structures in R/3 | 
| 620139 | Scenario A: Interdependent changes in sales documents - R/3 |