When you assign a planned order to a production line manually, using the planning table in repetitive manufacturing, the system generates capacity requirements for the planned order. The capacity requirements are calculated based on the production line, the quantity, and the production rate of the planned order. The system also checks the availability of the production line and displays any capacity overload or underload. The planned order is not converted to a production order, nor is the component availability or the picking list affected by the manual assignment. References: SAP Help Portal - Assigning Planned Orders to Production Lines, SAP S/4HANA Production Planning and Manufacturing Certification Guide - Chapter 7: Repetitive Manufacturing