Solution : https://service.sap.com/sap/support/notes/1343994 (SAP Service marketplace login required)
Key words :
sap_basis 620 sp67 sap_basis 640 sp25 sap_basis 700 sp20 sap_basis 701 sp05 sap_basis 702 sp02 sap_basis 710 sp09 sap_basis 711 sp03, sap_basis 620is, symptom method cl_abap_datfm=>conv_period_ext_to_int, prerequisites programming error, default date format, japanese date reason, correction instruction attached, date format, terms cl_abap_datfm, correction instruction
Related Notes :
| 831333 | Enable Japanese emperor, Islamic, and Farsi date format |