Problem in structure start with charecter type

i am doing a upgrade of an abap program which is written in 4.6 to ecc 6.0 i am facing a unicode error problem
in the old program there is a sap standrad structure called arc_buffer so in this program they have used the structure as
below code
    PERFORM read_file USING handle_tab_wa-offset record_len
                      CHANGING arc_buffer(record_len)
                               error_handling
                               p_message.
so when it is used as arc_buffer(record_len)   system is giving unicode error like
'' the structure arc_bufffer(record_len) does not start with a charecter type field'
as the structure is sap standard i think i cannot change the stadard structure so what should be done to get out of this error.

the structure arc_buffer has following fields
RCSZK
RNAME
CHECKSUM
FLAGS
SEGMENT
so in the routine
PERFORM read_file USING handle_tab_wa-offset record_len
CHANGING arc_buffer(record_len) "here just use it like arc_buffer-<field_name>(record_len)
error_handling
p_message.
or before calling the perform statement
data:lv_string type string.
call method cl_abap_container_utilities=>fill_container_c
exporting
im_value = arc_buffer
importing
ex_container = lv_string
exceptions
illegal_parameter_type = 1
others = 2.
PERFORM read_file USING handle_tab_wa-offset record_len
CHANGING lv_string(record_len) "here just use it like arc_buffer-<field_name>(record_len)
error_handling
p_message.

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Hello Everyone
Thank you for your replies.
I think I didn't explain myself clearly.
My goal is to be able to create an exact structure copy of a "Type ref to data" into a new internal table that is not defined yet.
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