Business Rules: IF Statement issues

I have an IF-ELSEIF statement based on an RTP in a Buisness Rule.  No matter what I choose in my RTP it only sets data based on the first IF statement.

IF({Activity_Plan} == "Boston  (Activity Plan)")             
              "No Cost Type"->"U_0151000001" = 1;
              "No Cost Type"->"U_0151600001" = 1;
              "No Cost Type"->"U_0151300001" = 1;
              "No Cost Type"->"U_0152000001" = 1;
              "No Cost Type"->"U_0150300001" = 1;
              "No Cost Type"->"U_0150400001" = 1;
              "No Cost Type"->"U_0150500001" = 1;
              "No Cost Type"->"U_0150600001" = 1;
              "No Cost Type"->"U_0150700001" = 1;
              "No Cost Type"->"U_0150800001" = 1;
              "No Cost Type"->"U_0152500001" = 1;
              "No Cost Type"->"U_0152300001" = 1;
              "No Cost Type"->"U_0150900001" = 1;