badi WORKORDER_UPDATE - MOVE_TO_LIT_NOTALLOWED_NODATA - dump

Hi All,

I am using BAdI WORKORDER_UPDATE - before_update method. And I want to update parameter IT_OPERATION. It does not allow me to update IT_OPERATION. I came to a conclusion that since it is an importing parameter it wont be allowed to change. Could you please suggest a way forward, on how to update a field in IT_OPERATION?

below is my code :

FIELD-SYMBOLS :<fs_cust1> TYPE any, 
               <fs_cust2> TYPE any. 
LOOP AT it_header INTO DATA(lwa_header). 
  READ TABLE it_operation INTO DATA(lwa_opr) 
                        WITH KEY aufpl = lwa_header-aufpl.
  IF sy-subrc = 0. 
    ASSIGN lwa_opr-zzcustomfield1 TO <fs_cust1>. 
    ASSIGN lwa_opr-zzcustomfield2 TO <fs_cust2>. 
    MOVE <fs_cust1> TO <fs_cust2>.
    UNASSIGN: <fs_cust1>, <fs_cust2>. 
  ENDIF.
* MOVE-CORRESPONDING lwa_opr to IT_OPERATION. ------ error line
Endloop.