Solution : https://service.sap.com/sap/support/notes/935101 (SAP Service marketplace login required)
Key words : 
call method cl_abap_container_utilities=>read_container_c    exporting      im_container          = ls_scappt-txt_pub_id    importing      ex_value              = ls_duration_rule    exceptions      illegal_parameter_type = 1, component crm-bf-dat, processing durations saved wihtin, multi-byte data types, field-symbols <lv_hex> type, lt_scappt type scapptseg occurs 0, check  ls_scappt-txt_pub_id, ls_duration_rule      type crmt_date_duration_as_rule, txt_pub_id eq space, corrupted data saved
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