Here is a link (if it works) to the NTSB docket regarding the PAPI's not being certified for aircraft with height 4 (Airbus 300).
http://dms.ntsb.gov/public%2F55000-5...7%2F549056.pdf
Runway 18 PAPI is certified for height group 3.
It is document number 48 on the docket.