A production promise needs an owner for the capacity behind it.
My first production schedule looked more certain than the factory it described. It had dates, quantities and machine assignments, and I had checked the arithmetic carefully. Then a tool arrived with a modification that was not reflected in the setup instructions. The job could not start as planned. I was a junior planner, with no authority to decide whether the change was acceptable, but I had already allowed its expected completion to support promises elsewhere in the schedule. I learnt that a plan can distribute an assumption much faster than an organisation can verify it.
I ask what each side must provide for an order to work, and what happens if that contribution changes. A low unit price can conceal an expensive reservation of people, equipment or tooling. The customer deserves to understand those obligations before they become a disagreement beside a machine.