Need help on making warehouse mandatory on a sales order header

Summary:

Need help on making warehouse mandatory on a sales order header

Code Snippet (add any code snippets that support your topic, if applicable):

import oracle.apps.scm.doo.common.extensions.ValidationException;
import oracle.apps.scm.doo.common.extensions.Message;

def warehouse = header.getAttribute("WarehouseId");  // Warehouse attribute at header

if (warehouse == null || warehouse.toString().trim().isEmpty()) {
   throw new ValidationException("Warehouse is mandatory at the header level");
}