How to do validation in Dynamic table update program?

Hi Experts,

I have a requirement to update any table by giving the table name, and an input file with table primary key and the field value need to update.

I am updating the table using the below code. Here I am getting the Primary keys and fields of the table using FM CACS_GET_TABLE_FIELDS.

But how can I check the full primary key of the table is available in the input file and corresponding entry is present in the table?

*--- Selection Screen
PARAMETERS: p_table TYPE dd02l-tabname OBLIGATORY.
PARAMETERS: p_file LIKE rlgrap-filename OBLIGATORY MEMORY ID ysm.

*--- Declarations for dynamic data
DATA gt_data TYPE REF TO data.
DATA GS_DATA TYPE REF TO data.

FIELD-SYMBOLS: <ft_data> TYPE STANDARD TABLE,
<FS_DATA> TYPE ANY.

START-OF-SELECTION.
*--- Create dynamic internal table
CREATE DATA gt_data TYPE TABLE OF (p_table).
ASSIGN gt_data->* TO <ft_data>.
*--- Create dynamic work area
CREATE DATA gs_data TYPE (p_table).
ASSIGN gs_data->* TO <fs_data>.
*--- Get Excel data in internal table
PERFORM f_convert_excel.
*--- Upload data to database table
PERFORM f_upload_table.
END-OF-SELECTION.

*&---------------------------------------------------------------------*
*& Form F_CONVERT_EXCEL
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
* --> p1 text
* <-- p2 text
*----------------------------------------------------------------------*
FORM f_convert_excel .

DATA lt_raw_data TYPE truxs_t_text_data.
CALL FUNCTION 'TEXT_CONVERT_XLS_TO_SAP'
EXPORTING
* I_FIELD_SEPERATOR =
i_line_header = 'X'
i_tab_raw_data = lt_raw_data
i_filename = P_file
TABLES
i_tab_converted_data = <FT_DATA>
EXCEPTIONS
conversion_failed = 1
OTHERS = 2.
IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
ENDFORM. " F_CONVERT_EXCEL

*&---------------------------------------------------------------------*
*& Form upload_data
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
FORM f_upload_table.
SET UPDATE TASK LOCAL. " Switch to local update
LOOP AT <ft_data> ASSIGNING <fs_data>.
MODIFY (P_TABLE) FROM <FS_DATA>.
IF SY-SUBRC = 0.
GV_SUCCESS = GV_SUCCESS + 1.
ELSE.
delete <ft_data> index sy-tabix.
GV_ERROR = GV_ERROR + 1.
ENDIF.
ENDLOOP.
ENDFORM. "upload_data

Regards,

Dipin