Why Does It Happen?

The number of trucks required for a certain job is calculated based on the settings of your software:

So when the calculator is ON, you cannot assign more trucks than the systems has calculated:

What Should I do?

If you need to assign an Additional Truck to a Job:

1. Turn off the calculator;
2. Choose the necessary truck;
3. Save Changes:
   

To remove an Additional Truck:

1. Click on the Name of the Truck;
2. Save Changes: