How HRPro calculates Annual Leave Actual Future Balance?

When the option "Actual Annual Leave Future Balance consider Future Entitlement" in Leave Module Setup, Annual Leave tab is turned OFF,

No Future Entitlement taken into consideration.

As of (Actual) Future Balance = Entitled - Taken + Adjustment - Approved Leave + Future Adjustment

                                           = 37.466 - 25 + 0 - 13.5 + 0 = -1.034

The employee is unable to apply future leave.

When the option "Actual Annual Leave Future Balance consider Future Entitlement" in Leave Module Setup, Annual Leave tab is turned ON

As of (Actual) Future Balance = Entitled - Taken + Adjustment - Approved Leave + Future Adjustment + Future Entitle

                                            = 37.466 - 25 + 0 - 13.5 + 0 + 11.918

                                            = 10.884

As the actual entitlement between 2014/07/02 to 2014/12/22 is taken into consideration. The employee can apply for leave now.