We Have a requirement, The employee can only apply the 2 days of WFH leaves in Month but not working

Summary:

We Have a requirement, The employee can only apply the 2 days of WFH leaves in Month, if tries to apply more than a month need to shows the error. For That we created one Validation Fast formula. But it's not working , the system will allows to apply and system not checking and getting the existing absence balance. challenges in creating the value set . NVL(SUM(Duration),0) not allowing in value column.

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