// Returns Item property reduced saving to base type.  You must specify the base 
// type to which the penalty applies (ie. will, reflex, or fortitude) and the penalty
// to be applied.  The constant for the base type starts with (IP_CONST_SAVEBASETYPE_*).
// The penalty must be a POSITIVE integer between 1 and 20 (ie. 1 = -1).
itemproperty ItemPropertyReducedSavingThrow(int nBonusType, int nPenalty);

Note: It is not clear why the values for IP_CONST_SAVEBASETYPE_* are not aligned with SAVING_THROW_* for those saves which are common to both