Error in ALV output

Hi All,

I am getting a runtime error in output while i try to do sum in ALV output.

In my ouput table i want to do sum for below feilds those are defined in output table :

CURR TYPE P DECIMALS 2,

B30 TYPE P DECIMALS 2,

B60 TYPE P DECIMALS 2,

B90 TYPE P DECIMALS 2,

B120 TYPE P DECIMALS 2,

BG121 TYPE P DECIMALS 2,

i defined feildcatalog as below:

WA_FIELDCAT-FIELDNAME = 'B60'.

WA_FIELDCAT-TABNAME = 'IT_FINAL'.

WA_FIELDCAT-SELTEXT_L = TEXT-033.

WA_FIELDCAT-DO_SUM = 'X' .

WA_FIELDCAT-OUTPUTLEN = 17.

WA_FIELDCAT-DATATYPE = 'DEC'.

APPEND WA_FIELDCAT TO IT_FIELDCAT.

CLEAR WA_FIELDCAT.

even if i try to download the ouput feilds in file,then also i am getting a run time error as field symbols are not assign,

Please help.

Thanks and Regards,

Mohit