Open Project Properties window.
Select REAL ICE under Categories.
Select Program Options from the Options Categories combo box
Check box if you want to enable low voltage programming (LVP).
For the LVP configuration bit set to "Low-voltage programming enabled", you may program in either high-voltage (default) or low-voltage (enabled here.)
For the LVP configuration bit set to "High-voltage on MCLR/Vpp must be used for programming", you may only program in high-voltage.
Not available on all devices.
This option is for programming only. It is not valid for debug operations.