Fast Formula for getting balance avail date in Oracle Absence Management?

Summary:

fast formula for getting balance avail date in Oracle Absence Management

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I need a fast formula for getting balance avail date in Oracle Absence Management. Below is the requirement:

Employee should not be able to use a specific leave after 6 month from the time the balance is availed to them.

Note: it's not based on plan enrolled date instead it's when balance is availed in the year and it will availed once in a year.

Thanks!

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