Expiration Date Table or DBI

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Can you please advise which table stores the expiration date column or DBI, as in my case expiration is 6 months and front loaded, so as expected balances will be available at the end of the accrual period(which includes expiration value), but ideally we should allow Employees to take leave negating the expiration value if employee applies leave before the expiration date, hence would need to know how to get expiration date and value so that i can add it to Employee's balance if Employee is applying leave before the accrual expiration date.