CPLEX: SUM Operator not available for dexpr float - sum

Question

I am trying to program the following mixed program:
enter image description here
where both xo and xi are to be boolean, thou xi was declared as a float given its the initial condition of the system and CPLEX doesnt allow boolean variables not linked to decision variables.
The markers cc and p are both strings collected from the Excel file.
Cplex is consistently giving the error on the C2 declaration as we see below:
//Standard Variables Initialization
{string} C_PN = ...;
{string} C_CC = ...;
{string} D_PN = ...;
{string} W_CC = ...;
{string} Xi_PN = ...;
{string} Xi_CC = ...;
float u = 0.9; //utilization factor
float C[C_PN][C_CC] = ...;
float D[Xi_PN] = ...;
float Profit[D_PN] = ...;
float Hours[D_PN] = ...;
float W[W_CC] = ...;
float Eff[W_CC] = ...;
int Xi[Xi_PN][Xi_CC]= ...;
float mu[D_PN] = ...;
execute{
for (p in D_PN) mu[p] = Hours[p]/Demand[p] ;//Hours/piece
}
//Decision Variables Initialization
dvar float+ h[Xi_PN][Xi_CC] ; //Produced Parts
dvar boolean Xo[Xi_PN][Xi_CC] ; //flag for pn x cc opening
//Linear optimization problem (linear program)
minimize
sum(p in C_PN, cc in C_CC) 1 + //(D[p] - h[p,cc])*Profit[p] +
sum(p in C_PN, cc in C_CC) 1;//(Xo[p,cc] + Xi[p,cc])*C[p,cc];
//Linear optimization problem (linear program)
subject to{
C1:forall(p in Xi_PN){
sum(cc in Xi_CC){ (Xo[p,cc] + Xi[p,cc])*h[p,cc]} <= D[p] ;} //Demand Constraint
C2:forall(cc in C_CC){
sum(p in C_PN) (Xo[p,cc] + Xi[p,cc])*h[p,cc]*mu[p] <= W[cc]*u*Eff[cc] ;} //Capacity Constraint
C3:forall(p in C_PN, cc in C_CC) Xo[p,cc] + Xi[p,cc] <= 1 ; //Only one tool per CC for each PN
}
As the error is not helpfull to understand the root cause, would any of you guys know more about what could be related to it?
Thanks a lot,

Answer 1

You should change
C1:forall(p in Xi_PN){
sum(cc in Xi_CC){ (Xo[p,cc] + Xi[p,cc])*h[p,cc]} <= D[p] ;} //Demand Constraint
into
C1:forall(p in Xi_PN){
sum(cc in Xi_CC) (Xo[p,cc] + Xi[p,cc])*h[p,cc] <= D[p] ;} //Demand Constraint