problem with abap code in lsmw.its urgent

Hello guys iam migrating open ar line items using lsmwand i need to create reconciliation key automatically so iam using below code which is working fine in abap editor but i inserted in the lsmw abap code block at step 5 mapping fields iam getting error as that function module does not exits .can any body go through the code and give me suggestion.your will be greatly appreciate.

types: begin of ty_fikey,

fikey type fikey_kk,

resob type resob_kk,

end of ty_fikey.

data: wa_fikey type ty_fikey.

CALL FUNCTION 'FKK_FIKEY_CHECK'

EXPORTING

I_FIKEY = 'jana56481'

• I_OPEN_ON_REQUEST =

• I_OPEN_WITHOUT_DIALOG =

• I_FOR_MASS_POSTING =

I_RESOB = '24 '

• I_RESKY = ' '

• I_NON_EXISTING_ALLOWED = ' '

• I_FOR_POSTING_IN_UPD = ' '

• EXCEPTIONS

• NON_EXISTING = 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.

select single fikey resob from dfkksumc into corresponding fields of wa_fikey where resob = '24'.

e1bpdfkkko-fikey = wa_fikey-fikey.

Regards

Janapathi