Consider a CRM system with a ‘Sales Order’ object. We aim to associate ‘Order Items’ and ‘Invoice’ with each Sales Order. In our setup, ‘Sales Order’ and ‘Order Items’ share a one-to-many relationship, meaning each sales order can have multiple order items. Conversely, ‘Sales Order’ and ‘Invoice’ are linked in a one-to-one relationship, where each sales order corresponds to a single invoice.