there is not Note for this as noted by Mithun as you are following the process correctly
If Time admin updates the leave directly in 2001, you have a leave request pending for same date ie in SENT Status you need to complete the process
in this case when you run rptarqpost, you must do with POST with infotype match, please read the documentation of this field
also, note if you have leave in 2001, you ll get the status error when you post them for this date follow above method and for the error status records use RPTARQERR
read the documentation of all these reports.
try avoiding update in 2001 directly, if you have to, on managers behalf, approve it via RPTARAPP and then post it etc