On the PS Vita system, you can play the PSP™Game software (games for the PSP™ (PlayStation®Portable) system) that you have downloaded from PlayStation®Store. Using this menu item, you can verify or delete the add-on data for the PSP™Game software.
With the memory card for the PS Vita system inserted, tap [Application Data Management] > [Add-On Data (PSP™)].
To delete the add-on data, tap 
(Options) > [Delete].