Restarting Interrupted Sessions in SAP

sm35 is the transaction code for batch input sessions.
A session that was interrupted while it was running will be in the Active state.
To retsart the session it must first be released.
Click on the session and select relese from the toolbar.

You can then start the session.
All transactions that were completed sucessfully during the previous run will be
skipped.
The transaction that was getting executed while the problem ocurred will be
repeated.

If the generation of the session itself was interrupted , it will be in
Being generated state.

You can run such a session.
But there is no gurantee that it has all the transaction information.
So in this case it is best to recreate the session.