GAMS bug in ifthen

   1  set k /k1,k2/;
   2  
   3  parameter p(k);
   4  
   5  p(k) = ifthen(sameas(k,'k1'),1,2);
****                              $201
**** 201  Invalid argument for function
   6  
   7  display p;

Work-around: use 1$sameas(k,'k1'). Note that if() allows a condition like this.