Solution : https://service.sap.com/sap/support/notes/88713 (SAP Service marketplace login required)
Key words : 
additional key words component supplier processing, problem affects messages v4018, message class v4, required message type, jit delivery schedule, customizing view v_160mva, message type, delivery schedule, variable messages, -mentioned messages
Related Notes : 
       
| 157448 | Incom. release: Release number is not always checked | 
| 74055 | Variable messages: Version maintenance | 
| 71092 | Deliv. scheds.: Messages despite compl.scheduling |