Access: SQL Query, Form, and Error Handling Help

Hi,

I am trying to develop a software for my Despatch Dept. But on the Form Order, I was trying to display the tblOrder.QuantityR, after adding the Quantity for a particular OrderID for tblOrderDetails.

I also need help on Error Handling.

And other errors in my Software.

Thanks

Attached Files

Despatch171112.rar (313.1 KB)