Read

    DATA: lt_keys TYPE /iwbep/t_mgw_tech_pairs,
          ls_key  TYPE LINE OF /iwbep/t_mgw_tech_pairs.

    "Keys to be read
    lt_keys = io_tech_request_context->get_keys( ).
    READ TABLE lt_keys INTO ls_key WITH KEY name = 'DOCUMENTNO'.
    IF sy-subrc EQ 0.
      lv_doc_number = ls_key-value.
    ENDIF.
    
    "Keys with COnversion routine applied
    DATA: ls_finding TYPE <entity_type>.
    io_tech_request_context->get_converted_keys( IMPORTING es_key_values = ls_finding ).