Solution : https://service.sap.com/sap/support/notes/201382 (SAP Service marketplace login required)
Key words : 
current stock/requirements list, additional key words md19, period lot-sizing procedures, period lot-sizing procedure, planning time fence ends, planning time fence due, actual planning time fence, lot-sizing procedure, planning time fence, planning time fences
Related Notes : 
       
| 197701 | MD19: Selection via planning time fence | 
| 187981 | Planning time fence and periodic lot size | 
| 148246 | Move planning time fence, lot size | 
| 64734 | Firming procedures 2 and 4 | 
| 40681 | Planning time fence and period lot size |