Function Sz_whyRecords 

pub unsafe extern "C" fn Sz_whyRecords(
    dataSourceCode1: *const c_char,
    recordID1: *const c_char,
    dataSourceCode2: *const c_char,
    recordID2: *const c_char,
    responseBuf: *mut *mut c_char,
    bufSize: *mut usize,
    resizeFunc: Option<unsafe extern "C" fn(ptr: *mut c_void, newSize: usize) -> *mut c_void>,
) -> i64

@brief This method determines how records are related to each other.