Solution : https://service.sap.com/sap/support/notes/83488 (SAP Service marketplace login required)
Key words : 
additional key words co01, attached source code corrections, imported hot package 27, imported hot package 12, production orders fall, adjust basic dates, basic dates, production order, -working day, factory calendar
Related Notes : 
       
| 194019 | Basic dates, production start are incorrect | 
| 121506 | Order finish date is before production finish date | 
| 78768 | Do not move basic dates to factory calendar day |