How to Change Handling Unit User Status

Hi All,

I am trying to change the HU Status using FM 'STATUS_CHANGE_EXTERN' but its not working.

lx_huheader-hu_id is the Internal Handling unit number.

CONCATENATE 'HU'

lx_huheader-hu_id INTO

lv_objnr.

CALL FUNCTION 'STATUS_CHANGE_EXTERN'

EXPORTING

client = sy-mandt

objnr = lv_objnr

user_status = 'E0002'

EXCEPTIONS

object_not_found = 1

status_inconsistent = 2

status_not_allowed = 3

OTHERS = 4.

Please guide me.

Thanks

Srinath