Change VIQMFE-FECOD in IW22

Hi
I need to change the value for VIQMFE-FECOD in IW22.

I have found a FM that can add a new entry, but I can't find the one that I can use to change FECOD

My code for adding a new entry looks like this:

CALL FUNCTION 'IQS0_ADD_ITEM'     EXPORTING       i_post   = 'X'       i_qmnum  = L_T_VIQMEL-qmnum       r_viqmfe = ls_viqmfe.
 * Implement suitable error handling here   CALL FUNCTION  'IQS1_POST_NOTIFICATION'                 EXPORTING  I_COMMIT = ' '        TABLES     E_VIQMEL = L_T_VIQMEL        EXCEPTIONS OTHERS   = 1.

Anyone who can help me, so I can modify an entry?

Thanks,

Lars