For a production version to be valid, which of the following must be fulfilled?

To ensure a production version is valid, it is essential that the deletion flag for the routing is not set. This is crucial because if the deletion flag is activated for a routing, it indicates that the routing is no longer valid for use in production. Consequently, the system will not allow any production version to reference or utilize that routing.

Having a routing without a deletion flag ensures that all associated details, such as operations and sequences necessary for the production process, are accessible and considered functional. This allows production planners to confidently use this routing when creating or executing manufacturing orders.

The other conditions relate to specific settings, like the structural configurations of the routing and its compatibility with lot size ranges, but they do not have the same fundamental importance as the necessity of the routing being active and available for production planning tasks.