Originally posted by: MVigneshwar

Hi,

I am trying to model a problem in CPLEX wherein I get the error OPL cannot extract expression in constraints con07a, con07b, con08.

I have attached the model, data and excel file. Can someone help me find the problem? 

You seem to have out of bounds.

If you rewrite

forall(i in I,j in J, t in T:t-1 in T)
      con07a:        //Find the maximum of two ready times and uses z to store info
          z[i][j][t]*(s[i][j][t-1]-sum(p in P,h in H) X[i][j][t][h][p]*r[p])
                  +(1-z[i][j][t])*(sum(p in P,h in H) X[i][j][t][h][p]*r[p]-s[i][j][t-1])>=0;
      
    forall(i in I,j in J, t in T:t-1 in T)
      con07b:        //The time before ambulance becomes available for the next trip
          s[i][j][t]>=z[i][j][t]*s[i][j][t-1]+(1-z[i][j][t])*(sum(p in P,h in H)X[i][j][t][h][p]*r[p])+
                          2*sum(p in P,h in H)X[i][j][t][h][p]*d[h];    
    
     forall(p in P)
       con08:        //Lateness
            L[p]==sum(i in I, j in J, t in T, h in H) X[i][j][t][h][p]*(v[p][i]-s[i][j][t]+d[h]);

The out of bounds should go away

Then you have to solve other issues and I attached the new file.

regards

Originally posted by: MVigneshwar

Thanks, this is great help. 

The program is running currently and I can proceed further. Thanks again