I need to look at the lines on an order, but someone else is in it?

There is a very quick solution to this one.  All you need to do is click the View Lines for a Highlighted Record on the toolbar.

On the toolbar in Customer Orders and Quotes is a button called "View Lines for a Highlighted Record"  .

This button allows you to view all the lines in a quote or order without actually opening it which allows others to edit/process the order.

When you click the button, the following screen appears.

From this screen you can view all the lines on an order or a quote.

You may also view or add notes, view  the purchase order, view areas, or view or add attachments  for each line listed.

A status On Order in Pink here indicates the material is actually in a to be ordered status.