reason for formatting error in smartform

Hi All,

I am calling the below function module from driver pgm, but it returns sy-subrc value 0. and not going to the smartfor. Can anybody tell what is the reason for that.

CALL FUNCTION FM_NAME

EXPORTING

I_BUDAT = I_BUDAT

I_IBLNR = I_IBLNR

I_PLANT = I_PLANT

I_ADRESS = I_ADRESS

I_POST_CODE = I_POST_CODE

I_HOUSE_NUM = I_HOUSE_NUM

I_CITY = I_CITY

I_COUNTRY = I_COUNTRY

• IMPORTING

• JOB_OUTPUT_INFO = LWA_JOB_OUTPUT

• TABLES

• z_i_item = z_i_item

EXCEPTIONS

FORMATTING_ERROR = 1

INTERNAL_ERROR = 2

SEND_ERROR = 3

USER_CANCELED = 4

OTHERS = 5.

IF SY-SUBRC <> 0.

Thanks,

Asha