How to convert a string ( p.e.: 25,56) into a quan (13,3) field?

I read data from an excel using function ALSM_EXCEL_TO_INTERNAL_TABLE. This data contains decimal numbers, for example 25,56.
DATA:li_intern TYPE TABLE OF alsmex_tabline WITH HEADER LINE.
lv_filename = pi_fich.
CALL FUNCTION 'ALSM_EXCEL_TO_INTERNAL_TABLE'
    EXPORTING
      filename                = lv_filename
      i_begin_col             = lv_start_col
      i_begin_row             = lv_start_row
      i_end_col               = lv_end_col
      i_end_row               = lv_end_row
    TABLES
      intern                  = li_intern
    EXCEPTIONS
      inconsistent_parameters = 1
      upload_ole              = 2
      OTHERS                  = 3.
li_intern-value field is a char50 field. I would like to convert this value in a field which type is quan 13 3.
Which function should I use?
Thanks in advance.

you can do it by creating a dynamic table.
use Fm     CALL FUNCTION 'LVC_FIELDCATALOG_MERGE' to get the fieldcat.
CALL METHOD cl_alv_table_create=>create_dynamic_table
    EXPORTING
      it_fieldcatalog = lt_fcat
    IMPORTING
      ep_table        = lt_dy_table.
lt_fcat can be filled like this...
    LOOP AT lt_struc_fld INTO ls_struc_fld.
      ls_fcat-dd_outlen = ls_struc_fld-intlen.
      ls_fcat-decimals = ls_struc_fld-decimals.
      ls_fcat-datatype = ls_struc_fld-datatype.
      ls_fcat-fieldname = ls_struc_fld-fieldname.
      APPEND ls_fcat TO lt_fcat.
    ENDLOOP.
and then you can move lt_excel_tab to your dyn_tab
Edited by: ssm on Jul 27, 2011 5:03 PM

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Dear All,
I am new to powershell script, i was trying to store a Ad user password set date to a variable add, add a number of days to get the expire date.
but when i try to convert the variable to date value, I am getting the error as below.
Please help me......
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¯\_(ツ)_/¯

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