How to calculate accrual plan balance in fast formula

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Hi Experts,

We have multiple validations in our Absence implementation where we have to calculate the plan balance. For this, I have been using below code snippet.

However, if we keep on adding Absence Adjustment Reasons to the dropdown, we will have to modify the formula to include the new adjustment reason too. This doesn't seem like an ideal way to calculate the plan balance. Is there any other way to calculate the plan balance without any dependency on the adjustment reason? Please suggest.

Thanks in advance.

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