catching the selected check box value in ALV Grid and process that rows

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Hi guru's,

I am displaying the records in ALV grid report. In this report i have check box. I have done enable and disbling some rows. Now i required to catch that check box value and based on check box i have to process for one transaction.

<b>Here my problem is after executing the report i am selecting check box manually . But it is not coming into the user-command. Here i am attaching my small code in this message.</b>

this wht for layout i am adding fileds.

GS_LAYOUT-BOX_FNAME = 'CHECK'.

GS_LAYOUT-NO_ROWMARK = 'X'.

GS_LAYOUT-STYLEFNAME = 'CELLTAB'.

GS_LAYOUT-CWIDTH_OPT = 'X'.

GS_LAYOUT-SEL_MODE = 'A'.

In function module i have filled this info

CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'

EXPORTING

I_CALLBACK_PROGRAM = W_REPID

I_GRID_TITLE = TEXT-003

I_CALLBACK_PF_STATUS_SET = 'SET_PF_STATUS'

I_CALLBACK_USER_COMMAND = 'USER_COMMAND'

IS_LAYOUT_LVC = GS_LAYOUT

IT_FIELDCAT_LVC = GT_FIELDCAT

*IT_SORT_LVC = GT_SORT[]

IS_SEL_HIDE = GT_ALV

TABLES

T_OUTTAB = GT_ALV

EXCEPTIONS

PROGRAM_ERROR = 1

OTHERS = 2.

usercommand form

CASE R_UCOMM.

WHEN 'UPDATE'.

LOOP AT GT_ALV WHERE CHECK = 'X'.

WRITE : 'success'.

ENDLOOP.

endcase.

Thanks in advance,

praveen