Solution : https://service.sap.com/sap/support/notes/575992 (SAP Service marketplace login required)
Key words : 
technical fiscal year variant, fiscal year variant, attached program corrections, program error, posting periods, period splits, planning table, terms add_ertag_and_atage_in_tp, solution bear, corrections
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods | 
| 569828 | Techn. business year variant with period unit P & W |