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. References: Executing Material Availability Checks; [SAP S/4HANA Production Planning and Manufacturing Certification Guide], page 83.

Increase the capacity supply in a time-phased interval: You can use the capacity planning table or the capacity planning board to increase the available capacity of a resource by changing the shift sequence, the shift duration, or the number of individual capacities. You can also use the capacity leveling function to distribute the capacity requirements over a longer time horizon. This way, you can avoid capacity overloads and create a balanced capacity load.
Determine a time period with available capacity on the planning board: You can use the planning board to visualize the capacity load and the capacity availability of a resource in a graphical Gantt chart. You can use the filter and zoom functions to focus on a specific time period and resource. You can also use the capacity evaluation function to display the capacity situation in a tabular or graphical form. This way, you can identify the time periods with available capacity and plan the operations accordingly.
Form optimum sequence to reduce setup times: You can use the setup matrix or the setup group key to define the setup times and the setup categories for a resource. You can also use the setup optimization function to determine the optimum sequence of operations that minimizes the total setup time. This way, you can reduce the capacity consumption and increase the throughput of the resource. References: Identifying the Basic Principles and Tools of Capacity Planning; SAP Help Portal;
[SAP S/4HANA Production Planning and Manufacturing Certification Guide], page 82.