Solution : https://service.sap.com/sap/support/notes/386137 (SAP Service marketplace login required)
Key words : 
additional key words cif_imod, sales orders froma linked, sap-apo system, attached correction improves, sales orders, /3 system takes, initial supply, prerequisites solution, correction, performance
Related Notes : 
       
| 389618 | Composite Note: APO initial data transfer with sales orders | 
| 370601 | Composite SAP note: APO 3.0 and 3.1 performance | 
| 328972 | APO integration of scheduling | 
| 322509 | APO integration of scheduling "Exit inserted" |