Ahhh, I'm sorry, I misunderstood your question.
The "undo" function is different in PDMLink that it was in Intralink 3.x. I have never successfully used the undo function since moving to PDMLink.
I thought you were referring to Canceling a checkout as opposed to the undo command.
I believe the way to get UNDO in PDMLink is to “Apply previous frame” in the pick action box, not by deleting the event. The way I understand it is if you do this, there is no way to undo it though. It is not like ILink3.x where you could undo the frame and then redo it if you didn’t like the result.
[cid:image001.png@01CEFA2B.4DE16D40]
Steve