Answer Posted / kiran kumar v

Yes. Subroutine can be called using ITCSY structure.

Sample Code:
/: PERFORM SUM IN PROGRAM ZPROGRAM
/: USING &VAR1&
/: USING &VAR2&
/: CHANGING &RESULT&
/: ENDPERFORM

In the program(ZPROGRAM), we need to write the form ....

FORM SUM TABLES INTAB STRUCTURE ITCSY
OUTTAB STRUCTURE ITCSY.
data: field1 type i,
field2 type i,
result type i.

TO read the values from the ITAB you have to use this logic.
READ TABLE INTAB WITH KEY NAME = 'VAR1'.
IF SY-SUBRC = 0.
FIELD1 = INTAB-VALUE.
ENDIF.

READ TABLE INTAB WITH KEY NAME = 'VAR2'.
IF SY-SUBRC = 0.
FIELD2 = ITAB-VALUE.
ENDIF.


RESULT = V_FIELD1 + V_FIELD2.
READ TABLE OUTTAB INDEX 1.
IF SY-SUBRC = 0.
OTAB-VALUE = RESULT.
MODIFY OUTTAB INDEX 1 .
ENDIF.
ENDFORM.

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