Hi @jrauh As a General rule, IFSAPP10 Core solution accepts Over deliveries, so if you want to prevent that, the Best option would to go for a small Customization.

However, if you don’t want to go for such Customization, you can use a Custom Event (Additional validation Created using the Core functionalities) to block the Over deliveries. A Simplest form is given below, but you may use a better Logic based on your Business requirements (for the Custom Event Action > Action Details). Otherwise, it could cause some inconvenience to business users,

1. Custom Event,

2. Event Action,

3. My Customer Order is ready for an Over Delivery (Over Picked 25 units while Sales Quantity is just 10 units),

4. Error when performing Delivery,