Determine Source of Supply for Delivery Schedules for MRP Areas 
Use
If delivery schedules for an MRP area are to be created during the planning run, the system must determine a valid vendor or a valid delivery schedule.
You create delivery schedules and use message management by making entries in the source list.
Prerequisites
- You have created a Scheduling agreement for each MRP area of a material.
- You have entered a receiving storage location in the scheduling agreement, which belongs to the MRP area.
You are only allowed to create one scheduling agreement for each vendor and receiving storage location.
- You have created an individual item for each scheduling agreement in the source list of the material.
- You have set the MRP indicator to 2 for Record relevant to MRP. Sched. lines generated automatically in the source list for each scheduling agreement item.
Features
A delivery schedule is assigned to an MRP area using the storage location that is entered in the scheduling agreement.
The system reads the source list for every material during the planning run. The system attempts to determine a valid vendor whose storage location belongs to the MRP area. If the system finds a valid scheduling agreement, it creates a delivery schedule for the MRP area of the material.
There is only one quota agreement for each material and plant. When planning at MRP area level, only quota arrangement items are adopted that have a storage location, which belongs to the MRP area.
Activities
You can maintain the scheduling agreement in the Purchasing task level menu: Outline agreement → Scheduling agreement → Create → Vendor known.
You can maintain the source list in the Purchasing task level menu by choosing, Master data → Source list → Maintain.