I don't see what difference open, or internal makes. The whole point of being with in the CS is that nothing resets even if you move to different areas within it.
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If you could carry over or reset your sick leave then whats to stop you constantly doing that.
Go out on sick leave, when its at the limit, move somewhere else in CS and repeat.
The whole point of the rolling limit is to stop it re-setting at the end of the year.
Does anyone think that a rolling limit resetting, and only in open competition, is a useful in any scenario for the employer?