[ C L A S S I C ]
Go to eLeave > Leave Setup > Company Setup > Under Advanced Leave Policy
For Annual leave:
Untick the option: "Disallow annual leave application if no. of days applied is more than the current leave balance"
For other leave types:
Untick the option: "Disallow non-annual leave application (other leave types) if the no. of days applied is more than the current leave balance"
[ E X P R E S S ]
Go to Leave > Configuration > Company Settings > Section 2: Staff Policy
Allow by choosing "Yes"