A production order can be created using several methods in SAP S/4HANA. One method is to create an order without a material (Transaction CO07). This is typically used for special cases like rework, repairs, or creating prototypes where a standard material master record is not applicable. Another method is through the Kanban process. In a pull-based replenishment strategy using Kanban, when a container's status is set to "empty," the system can be configured to automatically generate a production order as the replenishment element to produce the required quantity.

A. A purchase requisition is a formal request for external procurement and is converted into a purchase order, not an in-house production order.

C. Order release is a processing step that occurs after a production order has been created. Releasing an order authorizes its execution on the shop floor.

1. SAP S/4HANA Help Portal - Creating a Rework Order: This document explains the process of creating a production order without a material for rework purposes. It states, "You create a production order without a material to be manufactured... You create the rework order manually." This confirms the validity of creating an order without a material. (Source: SAP S/4HANA Official Documentation, Production Orders (PP-SFC)).

2. SAP S/4HANA Help Portal - Replenishment Using Production Orders (Kanban): This official documentation details the Kanban process. Under the "Prerequisites" section for in-house production, it specifies that a production order type must be defined for Kanban. The "Process Flow" section describes how changing the Kanban status to EMPTY triggers the creation of a production order. (Source: SAP S/4HANA Official Documentation, Kanban (PP-KAB)).

3. SAP S/4HANA Help Portal - Order Release: This document describes the function of releasing an order. It states, "The release of an order is the prerequisite for... printing shop floor papers, withdrawing material, [and] entering confirmations." This positions release as a step subsequent to creation. (Source: SAP S/4HANA Official Documentation, Production Orders (PP-SFC)).

4. SAP S/4HANA Help Portal - Conversion of Purchase Requisitions: This document outlines the procurement process, stating, "The purchasing department is responsible for converting purchase requisitions into purchase orders." This confirms that purchase requisitions lead to purchase orders for external procurement. (Source: SAP S/4HANA Official Documentation, Sourcing and Procurement).