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No direct experience of cycle manufacturing, but I do know for sure, in other industries a product may exist on paper and / or one off prototype form, but until sufficient orders are received which may cover a specific specialist tooling cost, a minimum production run for that product or some other specified sign off point for production linked to the confidence in the product to succeed, then accountants will not release production .. If money is tied up in stock, then it's not really working for your business!
I guess they haven't scaled production capacity to meet demand.