SAP allows you to create any number of Order reason codes. These codes are used to specify a reason why a particular order is being entered into SAP.
SAP Order reason codes are defined in configuration in your DEV system and must be transported to other systems in your landscape.
Transaction SPRO will take you to the SAP configuration area. Use the following menu path in configuration to create a new Order reason code.
Sales and Distribution –> Sales –> Sales Documents –> Sales Document Header –> Define Order Reasons
Once your new Order reason code has been defined, it will be available in the Order reason dropdown field at the order header level when using transaction VA01 to create a new order.