Reprocess scheduled absence records to re-calculate the duration / balances

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Hello

Can anyone advise if there is a process (processes) which can be run to re-evaluate the duration of absence requests already submitted and approved which include a date that has now been added as a Calendar Event. Also we'd need it to adjust the balances accordingly.

We have such a situation where many records are affected so would like to explore any options to adjust these records en-masse.

Thanks in advance for any help. 

Linda