"I'll have a number 3 please...no cheese on the hamburgers"
"I'm sorry sir...the number 3 only comes with cheese and I'm not able to override the system to take off the cheese."
"Can I get two hamburgers, a large fry, and a large coke instead?"
"Yes.."
"Can I get that for the same price as a number 3?"
"Sure! I can do that..."
The simple tasks in business can often by muddied by the desire to take the "thinking" out of the hands of those that work for you. When training your people on the technologies that you purchase it is always important to add in a component of knowing how "to get out of the box" and not allow the consumer to feel the restrictions that may exist by what you've implemented.