Able to Receive More Than Purchase Order Amount

System is allowing for receipts that exceed purchase order amount

Munis

To remove ability: 

1. Navigate to Financials > Purchasing > Setup > Purchasing Settings
2. Click on Requisition and Purchase Order Settings tab
3. In the Purchase Order Settings header check or uncheck Allow quantity received to be greater than quantity on PO line setting depending on site preference

Munis allows for this functionality but it can be removed by the use of restrictive settings.