You would need to look at quantity available not quantity on hand. Quantity on hand is the actual quantity you have regardless of what is on the Sales Orders since any Sales Order can change quantities anytime before the Sales Order is shipped then becomes a Sales Invoice where the quantity on hand is reduced by the quantity shipped. You can set up a warning message in Inventory Item Defaults, Ordering Tab, Sales Order out of stock warning if inventory is out of stock based on quantity available. 

Hope this helps you.

Have you considered implementing a real-time inventory management system that integrates with your sales order system wildcraft to ensure accurate tracking of quantity on hand?

1. Implement an Inventory Management System: Invest in an inventory management system that integrates with your sales order system. This system should update in real-time to reflect changes in stock levels whenever sales orders are placed or inventory is received.

2. Real-Time Inventory Tracking: Ensure that your inventory management system provides real-time tracking of stock levels. This allows all personnel entering sales orders to see the current quantity on hand before placing an order.

3. Set Up Stock Alerts: Configure your inventory management system to send alerts when stock levels reach a certain threshold. This helps in proactive management of inventory and prevents overselling by notifying you when quantities are running low.

4. Implement Order Management Rules: Establish rules within your sales order system to prevent orders from being processed if the requested quantity exceeds the available stock. This can be done through validation checks before orders are finalized.

5. Centralize Sales Order Entry: If possible, centralize the process of entering sales orders to a specific department or personnel. This reduces the likelihood of discrepancies caused by multiple individuals entering orders simultaneously.

6. Regular Inventory Audits: Conduct regular physical inventory audits to reconcile actual stock levels with the data in your inventory management system. This helps identify any discrepancies and ensures accuracy in inventory records.

7. Training and Communication: Provide training to your staff on the importance of accurate inventory management and the impact of overselling on customer satisfaction and operations. Encourage open communication channels for reporting any discrepancies or issues with inventory levels.