The work center that represents the production line for repetitive manufacturing is maintained in two places: the repetitive manufacturing profile and the production version. The repetitive manufacturing profile is a control parameter that defines the basic settingsfor repetitive manufacturing, such as the planning type, the backflushing method, the confirmation type, and the production line determination. The production version is a combination of a bill of material (BOM) and a routing or a rate routing that specifies how a material is produced. The production version also contains the work center that represents the production line for the material. The production version is assigned to the material master and is used in the planning and execution of repetitive manufacturing. References: Repetitive Manufacturing Profile | SAP Help Portal, Production Version | SAP Help Portal, Make-to-Stock Repetitive Manufacturing | SAP Help Portal.