Once the Sales Order is approved and the Subscription is created, user may change the Fixed Usage Quantity via the Change Order.
To change the fixed usage quantity, user may do the following:
1. Access the Subscription record.
2. In the Subscription Items tab > Subscription Item subtab, open the Primary or Secondary Subscription item in Edit mode.
3. Click the Change Order button.
4. In the Change Order window, select Modify Quantity for Fixed Usage link.
5. Set the New Quantity and Execution Date.
6. Save the Change Order window.