Solution : https://service.sap.com/sap/support/notes/450645 (SAP Service marketplace login required)
Key words : 
deleted requested schedule line, requested schedule line, schedule line subscreen, temporary quantity loads, additional key words, attached program corrections, item relevant, pressing enter, order network, apo system
Related Notes : 
       
| 442332 | SAPKU30006: Support Package 6 for EBP 3.0/CRM 3.0 | 
| 397032 | CRM 3.0-APO/ATP: Collective note / settings and restrictions |