7. Diff, Merge, Patch, and the Change Palette : Editing a File Using the Diff Tool : Diff Previous Transaction Error

Diff Previous Transaction Error
This error box appears when the selected version is the first version created in a stream or workspace. Thus, the search for a prior version in the stream or workspace fails.
Diff Toolbar Edit-by-Diff Buttons
Revert my change
Use the "before" version's section at this point. If the button is currently highlighted, you can hold down the Ctrl key and press to append the "before" section to the workspace version's section.
Restore my change
Use the workspace version's section at this point. If the button is currently highlighted, you can hold down the Ctrl key and press to append the workspace version's section to the "before" section.
Revert all my changes
Make the Edit pane the same as the "before" version.
Restore all my changes
Make the Edit pane the same as the "after" version.
Save edits and close
Store the current contents of the Edit pane in the workspace's file, without performing a Keep operation.

Micro Focus