a)In the transfer action, IT 0 & 1 would have been delimited on 1 Feb 15. Hence the old records of these would have ended on 31 Jan 15 and the new one started on 1 Feb 15.
b)In the salary change action, the IT 0 ending on 31 Feb 15 should again be delimited 1 Oct 14. This should result in the old IT 0 record end on 30 Sep 14 and new one start on 1 Oct 14.
IT 8: This would be similarly delimited for the one which has an end date >= 1 Oct 14, resulting in a new record starting on 1 Oct 14. If there were any records after 1 Oct 14, then the salary changes need to be reflected in these records also, with any other resultant changes in IT 8.
This would be more of a procedural or user guide issue, I believe and not a config issue. Of course it would impact any data load processes like the automatic salary increase, LSMW, etc.