Use the Select revision functionality to select a different revision of the selected part. The Isah info bar (immediately above the tabs) shows the revision of which the details are displayed. If you choose a different revision, the data relating to that revision will appear on your screen. The info bar is also updated to reflect the revision you selected.

Whether you choose a different revision or a different reference date, depends on the working method set on the Revision management tab of the Basic data form.