A production planning run in Advanced Planning (PP/DS) is a process that optimizes the supply and demand situation for a set of materials and locations within a given planning horizon. The possible results of a production planning run are:
Planned Order: A planned order is a proposal for internal production or external procurement of a material. A planned order can be converted into a production order or a purchase order, depending on the source of supply. A planned order can also be firmed, which means that it is not changed or deleted by subsequent planning runs.
Production Order: A production order is a document that defines the operations, materials, resources, and costs required to produce a material. A production order is created from a planned order or directly by the user. A production order can be released, confirmed, and settled as part of the production process. References: [SAP S/4HANA Production Planning and Manufacturing Certification Guide], page 181; [SAP Help Portal: Production Planning Run].

Consumption-based planning is a planning procedure that uses past consumption data to calculate the future requirements of materials. It does not consider the dependent requirements of higher-level materials, but only the independent requirements from sales orders, forecasts, or stock transfers. Consumption-based planning is suitable for B and C materials, which have low value, low demand variability, and high availability.
Consumption-based planning reduces the planning efforts for these materials, as it does not require the maintenance of BOMs, routings, or production versions. Consumption-based planning can be further divided into reorder point planning, forecast-based planning, and time-phased planning, depending on the method of determining the reorder point and the lot size12 References:
Consumption-Based Planning - SAP Help Portal
SAP S/4HANA Production Planning and Manufacturing Certification Guide, Chapter 3: Material Requirements Planning, Section 3.1: Planning Procedures, Page 67

A scheduling agreement is a long-term agreement with a vendor for the supply of materials or services at predefined dates and quantities. To enable classic MRP to automatically create schedule lines in case of material shortage, you must do the following:
Add the agreement to the source list and mark it for MRP relevance. The source list is a list of possible sources of supply for a material, such as vendors, contracts, or scheduling agreements. By adding the agreement to the source list and setting the MRP indicator, you specify that the agreement is a valid and preferred source of supply for the material.
Set the creation indicator for delivery schedule lines on the initial screen of the MRP run. The creation indicator determines whether the MRP run creates procurement proposals, such as purchase requisitions, planned orders, or delivery schedule lines. By setting the creation indicator for delivery schedule lines, you instruct the MRP run to create schedule lines for the scheduling agreement, based on the material requirements and the agreement conditions.
Adding the agreement to the quota arrangement and marking it for MRP relevance is not necessary, as the quota arrangement is used to distribute the total requirements of a material among several sources of supply.
Setting the creation indicator for purchase requisition on the initial screen of the MRP run is not correct, as the purchase requisition is a different type of procurement proposal than the delivery schedule line. References: Scheduling Agreement | SAP Help Portal, Source List | SAP Help Portal, MRP Run | SAP Help Portal.