Solution : https://service.sap.com/sap/support/notes/713621 (SAP Service marketplace login required)
Key words : 
insertion <<<<             --- delete source buffer entry                o_r_buffer-> delete, read table o_sx_mem_dir-th_map assigning < l_s_map>, table key s_key = i_s_key, insertion  < <<<                <l_s_map> -persist_mode = p_persist_mode, 10 content            import support package 14, 0b            import support package 20, l_buffer_id = o_r_buffer-> get_id, i_id = <l_s_map>-index, 50            import support package 02, termination cx_rsr_cache_error occurs
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