Solution : https://service.sap.com/sap/support/notes/388839 (SAP Service marketplace login required)
Key words :
'connection closed' cpic error, /sapapo/sdorder_item_maintain function module, material/plant combinations posted, terms cif cave_sl_doc_select reason, apo initial data transfer, initial data transfer, /sapapo/saplsdorder_db program, delivery schedules posted, data selection' parameters, apo posting shows
Related Notes :
389618 | Composite Note: APO initial data transfer with sales orders |
370601 | Composite SAP note: APO 3.0 and 3.1 performance |