Solution : https://service.sap.com/sap/support/notes/602590 (SAP Service marketplace login required)
Key words : 
lot-sizing procedures 'fixed lot sizes', 'start product heuristic immediately' action, net requirement calculation takes place, length-based net requirement calculation, ctp check takes place, cross-plant material variants, released factor batches based, dependent/stock transfer reqmt, create planning file entry, relevant material master records
Related Notes : 
       
| 444569 | Release restrictions for APO 3.10 Support Release 1 | 
| 426563 | CTP: Settings, system behavior and performance (docu) |