Hi!

I’m doing a producting planning for an university course, and I have a problem. The model has Inventory Balance Equations for 3 different departments and these inventories’ levels take place as variables. The inventory level is calculated with various equations (not given with this message) when the t € [1, 6], but **at time t=0**, the inventory levels **must be 0** for each product i, I didn’t make this part (at t=0). I’m waiting for your help.

```
Set
i "order"
t "time horizon" /t1*t6/;
Variable
invk(i,t) "the number of order i at the end of the period t in k department"
invr(i,t) "the number of order i at the end of the period t in r department"
invf(i,t) "the number of order i at the end of the period t in f department";
Equation
ibk(i,t) "inventory balance equation - k"
ibr(i,t) "inventory balance equation - r"
ibf(i,t) "inventory balance equation - f";
```