How to fetch plan balance in validation fast formula.

Summary:

Hello Experts,

I have an Absence Type and one Plan is attached to it. Employees are able to submit more than the balance acquired in the plan. Checked the setup in the Absence Type but all looks good. Now i want to fetch the plan balance and use that in the validation Fast Formula. Please help me how to fetch the plan balance in the Validation Fast Formula.

Thanks in Adavance.

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