Working pattern changes only to make changes to future annual leave bookings

When changing a working pattern sometimes the system will weirdly change some of the previous annual leave entries. When the change in working pattern should only have an effect on the future annual leave.

For example: Polly works 35 hrs 9-5 Mon to Fri. Polly changes to compressed in June meaning she now needs to use 8hrs 45 mins of holiday. PHR may have altered some of her previous holiday in Feb to 7hrs 30mins although she would have only used 7 hours for this time as that was what she needed to use for her working pattern at that time.

the issue means if you are not vigilant employees could end up with an incorrect holiday balance