1. In order to trigger MRP you have to maintain safety stock and reorder point.
2. In order to maintain the price and condition for the particular material, purchasing organisation and vendor combination you have to maintain purchase info record although you are maintaining price in scheduling agreements.
3. To run MRP the basic requirements are:
Maintaining MRP type, safety stock and consumption values and lot size
Exception cases: No need to maintain reorder point if your using Forecast based planning, Time Phased planning, Automatic reorder point