When you create a product master in SAP S/4HANA, you need to enter values for mandatory fields such as product number, product type, base unit of measure, and description. The product type determines the category of the product, such as material, service, or article. The base unit of measure defines the unit in which you manage the product in all business transactions. The selection screen for views and plants are optional fields that allow you to choose which views and plants you want to maintain for the product master. Reference: Creating Products, Understanding the Concept of Master Data

A production version is a combination of a BOM and a routing that defines how a material is produced. For a production version to be valid and consistent, the following requirements must be fulfilled:
The deletion flag must NOT be set for the BOM or the routing. The deletion flag indicates that the BOM or the routing is no longer used and should be archived. If the deletion flag is set, the production version cannot be used for production planning or execution.
The lot size range must be within the lot size range of the assigned routing. The lot size range specifies the minimum and maximum order quantity for which the production version is valid. The lot size range of the production version must match or be smaller than the lot size range of the routing, otherwise the system will not find a suitable routing for the production order.
The assigned routing and BOM must be valid in the entire validity period. The validity period defines the time frame for which the production version is valid. The validity period of the production version must be within or equal to the validity periods of the routing and the BOM, otherwise the system will not find a consistent BOM and routing combination for the production order. Reference: [SAP S/4HANA Production Planning and Manufacturing Certification Guide], page 113; [SAP Help Portal: Production Version].