Solution : https://service.sap.com/sap/support/notes/111708 (SAP Service marketplace login required)
Key words : 
additional key words omi1, planning time fence, attached advance corrections, incorrect source code, material requirements planning, material shortage exists, material shortage, capacity requirements, correction exists, material shortages
Related Notes : 
       
| 120778 | MRP: Available safety stock and rounding value | 
| 84320 | Make-to-order planning with fixing logic | 
| 73378 | MD01: Safety stock is not covered | 
| 64734 | Firming procedures 2 and 4 |