Solution : https://service.sap.com/sap/support/notes/103635 (SAP Service marketplace login required)
Key words : 
update tkebl set   perflag2  = '1'                      periv2    = 'wk', update tkeb  set   perflag2  = '1'                      periv2    = 'wk', transaction kea0 - maintain operating concern, additional key words kea0, moved period / week         assignment, call function module 'copa_generate_rkee0000', short dump raise_exception occurs, fiscal year variant representing, 'maintain operating concern' attributes, function key f8=test
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods | 
| 660097 | |
| 328006 |