Function Module issue !!

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Dear All,

I am using the fuction module /SDF/CMO_DATETIME_DIFFERENCE to calculate the diffence days between 2 dates.Here i am want to write the difference days as output? How to import and write the DIFFDAYS? my code is as below.

&----

*& Report ZTESTMAIN

*&

&----

*&

&----

Report 556.

Parameters:p_frdate type d,

p_todate type d.

data: date1 type d,

date2 type d.

data: datediff type d.

date1 = p_frdate.

date2 = p_todate.

CALL FUNCTION '/SDF/CMO_DATETIME_DIFFERENCE'

EXPORTING

DATE1 = date1

TIME1 =

DATE2 = date2

TIME2 =

IMPORTING

DATEDIFF = datediff

TIMEDIFF =
EARLIEST =

EXCEPTIONS

INVALID_DATETIME = 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.

CALL FUNCTION '/SDF/CMO_DATETIME_DIFFERENCE'
EXPORTING
DATE1 = p_frdate.

TIME1 =

DATE2 = p_todate.

TIME2 =
IMPORTing

DAteDIFF = datediff

TIMEDIFF =
EARLIEST =
EXCEPTIONS
INVALID_DATETIME = 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.

Write : / datediff.

Write is not working here PLEASE SUGGEST ME HOW TO DO THIS?

Thanks & Regards,

Murali.