Solution : https://service.sap.com/sap/support/notes/366674 (SAP Service marketplace login required)
Key words : 
additional key words variable message, message type 'e', message type 'i', customize variable messages, required system response, variable message, error message, v4 message, information message, system issues
Related Notes : 
       
| 551929 | SD document blocked: No billing-relevance (third-party) II | 
| 359265 | Incorrect correlation/processing after V4 message | 
| 351554 | No processing of documents after V4 error message II | 
| 338982 | No processing of document after V4 error message | 
| 206452 | Quantity change in ordered third-party order |