A material availability check can be triggered automatically for a production order by the following methods:
By mass processing: You can use the mass processing function to execute material availability checks for multiple production orders at once. You can use the Manage Production Orders app or the transaction COHV to perform mass processing. You can define the selection criteria and the scope of check for the orders to be checked. The system updates the availability status and the committed quantities for the checked orders.
By order release: You can configure the system to trigger a material availability check automatically when a production order is released. You can use the Customizing activity Define Checking Control to define the checking rule and the scope of check for the order release. The system updates the availability status and the committed quantities for the released order. Reference: Executing Material Availability Checks; [SAP S/4HANA Production Planning and Manufacturing Certification Guide], page 83.