Getting it right twice is harder than getting it right once
On a single order, correctness is the whole problem. On a schedule, repeatability is.
That is why the description agreed at the start is treated as a working document rather than a formality. It records what was supplied, against which application, for which seating position — the reference a second batch is measured against.
It also makes change manageable. When a quantity moves, a position is added or a mounting arrangement is revised part-way through a programme, it is handled as an amendment to something specific rather than as a new conversation started from memory.
None of this is unusual. It is simply what makes the difference between a supplier you can plan around and one you have to re-explain your requirement to every time.
How recurring requirements are planned →