Answer Posted / dilip

We need pass a value to user command parameter i.e.
I_callback_user command = 'USER_COMMAND'.

Then we need to explicitly create Form ( subroutine ) with name USER_COMMAND.

FORM USER_COMMAND USING OK_CODE LIKE SY-UCOMM
SELFIELD TYPE SLIS_SELFIELD.
.

CASE COMMAND.
WHEN '&IC1'. " When ever user click on the action will be
" stored under this sy-ucomm value

*--- selfield structure will actually hold the table index of internal table/value base on which we can build our logic furter.

READ TABLE T_EKKO INTO LWA_EKKO INDEX SELFIELD-TABINDEX.
IF SY-SUBRC = 0.

ENDIF.


WHEN OTHERS.
ENDCASE.

ENDFORM

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