$title 'One element dynamic control inside IF' (ONELAB1,SEQ=168)

Sets tmax      / period01 * period02/,
     t(tmax);
scalar foo /1/;
Parameters periodln(tmax) /    period01 11,     period02 20   /,
           tot1,tot2,tot3;

t('period01')=yes;
* update set inside if

if(foo,
  t('period02')=yes;
  tot1=sum(t(tmax),periodln(tmax));
  tot2=sum(tmax,   periodln(tmax));
  tot3=sum(t,      periodln(t)););

abort$(tot1 <> 31) 'tot1 is wrong',tot1,tot2,tot3;
abort$(tot2 <> 31) 'tot2 is wrong',tot1,tot2,tot3;
abort$(tot3 <> 31) 'tot3 is wrong',tot1,tot2,tot3;