How employee can apply 8 hours of paid leave if they have less leave balance.

Summary:

Employee want to raise paid leave for 8 hrs but they have leave balance only 5 hrs. We want to understand how in this case employee can apply for 8 hours of paid leave without balance going in negative such that 3 hour is automatically considered as unpaid. 

I understand that employee can apply leave for the amount of balance which they have but I need a workaround for this. If anyone knows this , it will be of great help.

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23D

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