Solution : https://service.sap.com/sap/support/notes/97817 (SAP Service marketplace login required)
Key words : 
additional key words basic datesco01, 'adjust basic dates' indicator, order start date, order finish date, basic dates, basic date, production orderiw31, maintenance ordercn21, program error, solution repair
Related Notes : 
       
| 194019 | Basic dates, production start are incorrect | 
| 121506 | Order finish date is before production finish date | 
| 46237 | Consulting: determination of the order dates |