Solution : https://service.sap.com/sap/support/notes/480472 (SAP Service marketplace login required)
Key words : 
caufvd-gltrp planned order conversion, basic finish date reason, basic finish date, lead time scheduling, -house production time, attached program corrections, basic date, planned order, production order, basic dates
Related Notes : 
       
| 632951 | Basic date in planned order incorrectly adjusted | 
| 447451 | Basic finish date is moved in planned order | 
| 438291 | Planned order (Conversion): Scheduling type with times |