Schedule lines in planning delivery schedules are already relevant for requirements. In the instruction, you specify if they are relevant for delivery. If so, they replace schedule lines in the forecast delivery schedule.
The delivery relevance indicator pertains only to schedule lines whose dates lie outside the just-in-time (JIT) delivery schedule horizon. For more information on how forecast and JIT delivery schedules affect requirements and delivery relevance in the planning delivery schedule, see
Requirements and Delivery Relevance.